diff --git a/sleekxmpp/plugins/xep_0045.py b/sleekxmpp/plugins/xep_0045.py
index e7f8c7e..d5fbf00 100644
--- a/sleekxmpp/plugins/xep_0045.py
+++ b/sleekxmpp/plugins/xep_0045.py
@@ -20,325 +20,333 @@ log = logging.getLogger(__name__)
 
 
 class MUCPresence(ElementBase):
-	name = 'x'
-	namespace = 'http://jabber.org/protocol/muc#user'
-	plugin_attrib = 'muc'
-	interfaces = set(('affiliation', 'role', 'jid', 'nick', 'room'))
-	affiliations = set(('', ))
-	roles = set(('', ))
+    name = 'x'
+    namespace = 'http://jabber.org/protocol/muc#user'
+    plugin_attrib = 'muc'
+    interfaces = set(('affiliation', 'role', 'jid', 'nick', 'room'))
+    affiliations = set(('', ))
+    roles = set(('', ))
 
-	def getXMLItem(self):
-		item = self.xml.find('{http://jabber.org/protocol/muc#user}item')
-		if item is None:
-			item = ET.Element('{http://jabber.org/protocol/muc#user}item')
-			self.xml.append(item)
-		return item
+    def getXMLItem(self):
+        item = self.xml.find('{http://jabber.org/protocol/muc#user}item')
+        if item is None:
+            item = ET.Element('{http://jabber.org/protocol/muc#user}item')
+            self.xml.append(item)
+        return item
 
-	def getAffiliation(self):
-		#TODO if no affilation, set it to the default and return default
-		item = self.getXMLItem()
-		return item.get('affiliation', '')
+    def getAffiliation(self):
+        #TODO if no affilation, set it to the default and return default
+        item = self.getXMLItem()
+        return item.get('affiliation', '')
 
-	def setAffiliation(self, value):
-		item = self.getXMLItem()
-		#TODO check for valid affiliation
-		item.attrib['affiliation'] = value
-		return self
+    def setAffiliation(self, value):
+        item = self.getXMLItem()
+        #TODO check for valid affiliation
+        item.attrib['affiliation'] = value
+        return self
 
-	def delAffiliation(self):
-		item = self.getXMLItem()
-		#TODO set default affiliation
-		if 'affiliation' in item.attrib: del item.attrib['affiliation']
-		return self
+    def delAffiliation(self):
+        item = self.getXMLItem()
+        #TODO set default affiliation
+        if 'affiliation' in item.attrib: del item.attrib['affiliation']
+        return self
 
-	def getJid(self):
-		item = self.getXMLItem()
-		return JID(item.get('jid', ''))
+    def getJid(self):
+        item = self.getXMLItem()
+        return JID(item.get('jid', ''))
 
-	def setJid(self, value):
-		item = self.getXMLItem()
-		if not isinstance(value, str):
-			value = str(value)
-		item.attrib['jid'] = value
-		return self
+    def setJid(self, value):
+        item = self.getXMLItem()
+        if not isinstance(value, str):
+            value = str(value)
+        item.attrib['jid'] = value
+        return self
 
-	def delJid(self):
-		item = self.getXMLItem()
-		if 'jid' in item.attrib: del item.attrib['jid']
-		return self
+    def delJid(self):
+        item = self.getXMLItem()
+        if 'jid' in item.attrib: del item.attrib['jid']
+        return self
 
-	def getRole(self):
-		item = self.getXMLItem()
-		#TODO get default role, set default role if none
-		return item.get('role', '')
+    def getRole(self):
+        item = self.getXMLItem()
+        #TODO get default role, set default role if none
+        return item.get('role', '')
 
-	def setRole(self, value):
-		item = self.getXMLItem()
-		#TODO check for valid role
-		item.attrib['role'] = value
-		return self
+    def setRole(self, value):
+        item = self.getXMLItem()
+        #TODO check for valid role
+        item.attrib['role'] = value
+        return self
 
-	def delRole(self):
-		item = self.getXMLItem()
-		#TODO set default role
-		if 'role' in item.attrib: del item.attrib['role']
-		return self
+    def delRole(self):
+        item = self.getXMLItem()
+        #TODO set default role
+        if 'role' in item.attrib: del item.attrib['role']
+        return self
 
-	def getNick(self):
-		return self.parent()['from'].resource
+    def getNick(self):
+        return self.parent()['from'].resource
 
-	def getRoom(self):
-		return self.parent()['from'].bare
+    def getRoom(self):
+        return self.parent()['from'].bare
 
-	def setNick(self, value):
-		log.warning("Cannot set nick through mucpresence plugin.")
-		return self
+    def setNick(self, value):
+        log.warning("Cannot set nick through mucpresence plugin.")
+        return self
 
-	def setRoom(self, value):
-		log.warning("Cannot set room through mucpresence plugin.")
-		return self
+    def setRoom(self, value):
+        log.warning("Cannot set room through mucpresence plugin.")
+        return self
 
-	def delNick(self):
-		log.warning("Cannot delete nick through mucpresence plugin.")
-		return self
+    def delNick(self):
+        log.warning("Cannot delete nick through mucpresence plugin.")
+        return self
 
-	def delRoom(self):
-		log.warning("Cannot delete room through mucpresence plugin.")
-		return self
+    def delRoom(self):
+        log.warning("Cannot delete room through mucpresence plugin.")
+        return self
 
 class xep_0045(base.base_plugin):
-	"""
-	Impliments XEP-0045 Multi User Chat
-	"""
+    """
+    Implements XEP-0045 Multi User Chat
+    """
 
-	def plugin_init(self):
-		self.rooms = {}
-		self.ourNicks = {}
-		self.xep = '0045'
-		self.description = 'Multi User Chat'
-		# load MUC support in presence stanzas
-		registerStanzaPlugin(Presence, MUCPresence)
-		self.xmpp.registerHandler(Callback('MUCPresence', MatchXMLMask("<presence xmlns='%s' />" % self.xmpp.default_ns), self.handle_groupchat_presence))
-		self.xmpp.registerHandler(Callback('MUCMessage', MatchXMLMask("<message xmlns='%s' type='groupchat'><body/></message>" % self.xmpp.default_ns), self.handle_groupchat_message))
-		self.xmpp.registerHandler(Callback('MUCSubject', MatchXMLMask("<message xmlns='%s' type='groupchat'><subject/></message>" % self.xmpp.default_ns), self.handle_groupchat_subject))
+    def plugin_init(self):
+        self.rooms = {}
+        self.ourNicks = {}
+        self.xep = '0045'
+        self.description = 'Multi User Chat'
+        # load MUC support in presence stanzas
+        registerStanzaPlugin(Presence, MUCPresence)
+        self.xmpp.registerHandler(Callback('MUCPresence', MatchXMLMask("<presence xmlns='%s' />" % self.xmpp.default_ns), self.handle_groupchat_presence))
+        self.xmpp.registerHandler(Callback('MUCMessage', MatchXMLMask("<message xmlns='%s' type='groupchat'><body/></message>" % self.xmpp.default_ns), self.handle_groupchat_message))
+        self.xmpp.registerHandler(Callback('MUCSubject', MatchXMLMask("<message xmlns='%s' type='groupchat'><subject/></message>" % self.xmpp.default_ns), self.handle_groupchat_subject))
+        self.xmpp.registerHandler(Callback('MUCInvite', MatchXPath("{%s}message/{http://jabber.org/protocol/muc#user}x/invite" % self.xmpp.default_ns), self.handle_groupchat_invite))
 
-	def handle_groupchat_presence(self, pr):
-		""" Handle a presence in a muc.
-		"""
-		got_offline = False
-		got_online = False
-		if pr['muc']['room'] not in self.rooms.keys():
-			return
-		entry = pr['muc'].getStanzaValues()
-		entry['show'] = pr['show']
-		entry['status'] = pr['status']
-		if pr['type'] == 'unavailable':
-			if entry['nick'] in self.rooms[entry['room']]:
-				del self.rooms[entry['room']][entry['nick']]
-			got_offline = True
-		else:
-			if entry['nick'] not in self.rooms[entry['room']]:
-				got_online = True
-			self.rooms[entry['room']][entry['nick']] = entry
-		log.debug("MUC presence from %s/%s : %s" % (entry['room'],entry['nick'], entry))
-		self.xmpp.event("groupchat_presence", pr)
-		self.xmpp.event("muc::%s::presence" % entry['room'], pr)
-		if got_offline:
-			self.xmpp.event("muc::%s::got_offline" % entry['room'], pr)
-		if got_online:
-			self.xmpp.event("muc::%s::got_online" % entry['room'], pr)
+    def handle_groupchat_invite(self, inv):
+        """ Handle an invite into a muc.
+        """
+        logging.debug("MUC invite to %s from %s: %s" % (inv['from'], inv["from"], inv))
+        if inv['from'] not in self.rooms.keys():
+            self.xmpp.event("groupchat_invite", inv)
 
-	def handle_groupchat_message(self, msg):
-		""" Handle a message event in a muc.
-		"""
-		self.xmpp.event('groupchat_message', msg)
-		self.xmpp.event("muc::%s::message" % msg['from'].bare, msg)
+    def handle_groupchat_presence(self, pr):
+        """ Handle a presence in a muc.
+        """
+        got_offline = False
+        got_online = False
+        if pr['muc']['room'] not in self.rooms.keys():
+            return
+        entry = pr['muc'].getStanzaValues()
+        entry['show'] = pr['show']
+        entry['status'] = pr['status']
+        if pr['type'] == 'unavailable':
+            if entry['nick'] in self.rooms[entry['room']]:
+                del self.rooms[entry['room']][entry['nick']]
+            got_offline = True
+        else:
+            if entry['nick'] not in self.rooms[entry['room']]:
+                got_online = True
+            self.rooms[entry['room']][entry['nick']] = entry
+        log.debug("MUC presence from %s/%s : %s" % (entry['room'],entry['nick'], entry))
+        self.xmpp.event("groupchat_presence", pr)
+        self.xmpp.event("muc::%s::presence" % entry['room'], pr)
+        if got_offline:
+            self.xmpp.event("muc::%s::got_offline" % entry['room'], pr)
+        if got_online:
+            self.xmpp.event("muc::%s::got_online" % entry['room'], pr)
 
-	def handle_groupchat_subject(self, msg):
-		""" Handle a message coming from a muc indicating
-		a change of subject (or announcing it when joining the room)
-		"""
-		self.xmpp.event('groupchat_subject', msg)
+    def handle_groupchat_message(self, msg):
+        """ Handle a message event in a muc.
+        """
+        self.xmpp.event('groupchat_message', msg)
+        self.xmpp.event("muc::%s::message" % msg['from'].bare, msg)
 
-	def jidInRoom(self, room, jid):
-		for nick in self.rooms[room]:
-			entry = self.rooms[room][nick]
-			if entry is not None and entry['jid'].full == jid:
-				return True
-		return False
+    def handle_groupchat_subject(self, msg):
+        """ Handle a message coming from a muc indicating
+        a change of subject (or announcing it when joining the room)
+        """
+        self.xmpp.event('groupchat_subject', msg)
 
-	def getNick(self, room, jid):
-		for nick in self.rooms[room]:
-			entry = self.rooms[room][nick]
-			if entry is not None and entry['jid'].full == jid:
-				return nick
+    def jidInRoom(self, room, jid):
+        for nick in self.rooms[room]:
+            entry = self.rooms[room][nick]
+            if entry is not None and entry['jid'].full == jid:
+                return True
+        return False
 
-	def getRoomForm(self, room, ifrom=None):
-		iq = self.xmpp.makeIqGet()
-		iq['to'] = room
-		if ifrom is not None:
-			iq['from'] = ifrom
-		query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
-		iq.append(query)
-		result = iq.send()
-		if result['type'] == 'error':
-			return False
-		xform = result.xml.find('{http://jabber.org/protocol/muc#owner}query/{jabber:x:data}x')
-		if xform is None: return False
-		form = self.xmpp.plugin['old_0004'].buildForm(xform)
-		return form
+    def getNick(self, room, jid):
+        for nick in self.rooms[room]:
+            entry = self.rooms[room][nick]
+            if entry is not None and entry['jid'].full == jid:
+                return nick
 
-	def configureRoom(self, room, form=None, ifrom=None):
-		if form is None:
-			form = self.getRoomForm(room, ifrom=ifrom)
-			#form = self.xmpp.plugin['old_0004'].makeForm(ftype='submit')
-			#form.addField('FORM_TYPE', value='http://jabber.org/protocol/muc#roomconfig')
-		iq = self.xmpp.makeIqSet()
-		iq['to'] = room
-		if ifrom is not None:
-			iq['from'] = ifrom
-		query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
-		form = form.getXML('submit')
-		query.append(form)
-		iq.append(query)
-		result = iq.send()
-		if result['type'] == 'error':
-			return False
-		return True
+    def getRoomForm(self, room, ifrom=None):
+        iq = self.xmpp.makeIqGet()
+        iq['to'] = room
+        if ifrom is not None:
+            iq['from'] = ifrom
+        query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
+        iq.append(query)
+        result = iq.send()
+        if result['type'] == 'error':
+            return False
+        xform = result.xml.find('{http://jabber.org/protocol/muc#owner}query/{jabber:x:data}x')
+        if xform is None: return False
+        form = self.xmpp.plugin['old_0004'].buildForm(xform)
+        return form
 
-	def joinMUC(self, room, nick, maxhistory="0", password='', wait=False, pstatus=None, pshow=None):
-		""" Join the specified room, requesting 'maxhistory' lines of history.
-		"""
-		stanza = self.xmpp.makePresence(pto="%s/%s" % (room, nick), pstatus=pstatus, pshow=pshow)
-		x = ET.Element('{http://jabber.org/protocol/muc}x')
-		if password:
-			passelement = ET.Element('password')
-			passelement.text = password
-			x.append(passelement)
-		if maxhistory:
-			history = ET.Element('history')
-			if maxhistory ==  "0":
-				history.attrib['maxchars'] = maxhistory
-			else:
-				history.attrib['maxstanzas'] = maxhistory
-			x.append(history)
-		stanza.append(x)
-		if not wait:
-			self.xmpp.send(stanza)
-		else:
-			#wait for our own room presence back
-			expect = ET.Element("{%s}presence" % self.xmpp.default_ns, {'from':"%s/%s" % (room, nick)})
-			self.xmpp.send(stanza, expect)
-		self.rooms[room] = {}
-		self.ourNicks[room] = nick
+    def configureRoom(self, room, form=None, ifrom=None):
+        if form is None:
+            form = self.getRoomForm(room, ifrom=ifrom)
+            #form = self.xmpp.plugin['old_0004'].makeForm(ftype='submit')
+            #form.addField('FORM_TYPE', value='http://jabber.org/protocol/muc#roomconfig')
+        iq = self.xmpp.makeIqSet()
+        iq['to'] = room
+        if ifrom is not None:
+            iq['from'] = ifrom
+        query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
+        form = form.getXML('submit')
+        query.append(form)
+        iq.append(query)
+        result = iq.send()
+        if result['type'] == 'error':
+            return False
+        return True
 
-	def destroy(self, room, reason='', altroom = '', ifrom=None):
-		iq = self.xmpp.makeIqSet()
-		if ifrom is not None:
-			iq['from'] = ifrom
-		iq['to'] = room
-		query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
-		destroy = ET.Element('destroy')
-		if altroom:
-			destroy.attrib['jid'] = altroom
-		xreason = ET.Element('reason')
-		xreason.text = reason
-		destroy.append(xreason)
-		query.append(destroy)
-		iq.append(query)
-		r = iq.send()
-		if r is False or r['type'] == 'error':
-			return False
-		return True
+    def joinMUC(self, room, nick, maxhistory="0", password='', wait=False, pstatus=None, pshow=None):
+        """ Join the specified room, requesting 'maxhistory' lines of history.
+        """
+        stanza = self.xmpp.makePresence(pto="%s/%s" % (room, nick), pstatus=pstatus, pshow=pshow)
+        x = ET.Element('{http://jabber.org/protocol/muc}x')
+        if password:
+            passelement = ET.Element('password')
+            passelement.text = password
+            x.append(passelement)
+        if maxhistory:
+            history = ET.Element('history')
+            if maxhistory ==  "0":
+                history.attrib['maxchars'] = maxhistory
+            else:
+                history.attrib['maxstanzas'] = maxhistory
+            x.append(history)
+        stanza.append(x)
+        if not wait:
+            self.xmpp.send(stanza)
+        else:
+            #wait for our own room presence back
+            expect = ET.Element("{%s}presence" % self.xmpp.default_ns, {'from':"%s/%s" % (room, nick)})
+            self.xmpp.send(stanza, expect)
+        self.rooms[room] = {}
+        self.ourNicks[room] = nick
 
-	def setAffiliation(self, room, jid=None, nick=None, affiliation='member'):
-		""" Change room affiliation."""
-		if affiliation not in ('outcast', 'member', 'admin', 'owner', 'none'):
-			raise TypeError
-		query = ET.Element('{http://jabber.org/protocol/muc#admin}query')
-		if nick is not None:
-			item = ET.Element('item', {'affiliation':affiliation, 'nick':nick})
-		else:
-			item = ET.Element('item', {'affiliation':affiliation, 'jid':jid})
-		query.append(item)
-		iq = self.xmpp.makeIqSet(query)
-		iq['to'] = room
-		result = iq.send()
-		if result is False or result['type'] != 'result':
-			raise ValueError
-		return True
+    def destroy(self, room, reason='', altroom = '', ifrom=None):
+        iq = self.xmpp.makeIqSet()
+        if ifrom is not None:
+            iq['from'] = ifrom
+        iq['to'] = room
+        query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
+        destroy = ET.Element('destroy')
+        if altroom:
+            destroy.attrib['jid'] = altroom
+        xreason = ET.Element('reason')
+        xreason.text = reason
+        destroy.append(xreason)
+        query.append(destroy)
+        iq.append(query)
+        r = iq.send()
+        if r is False or r['type'] == 'error':
+            return False
+        return True
 
-	def invite(self, room, jid, reason=''):
-		""" Invite a jid to a room."""
-		msg = self.xmpp.makeMessage(room)
-		msg['from'] = self.xmpp.boundjid.bare
-		x = ET.Element('{http://jabber.org/protocol/muc#user}x')
-		invite = ET.Element('{http://jabber.org/protocol/muc#user}invite', {'to': jid})
-		if reason:
-			rxml = ET.Element('reason')
-			rxml.text = reason
-			invite.append(rxml)
-		x.append(invite)
-		msg.append(x)
-		self.xmpp.send(msg)
+    def setAffiliation(self, room, jid=None, nick=None, affiliation='member'):
+        """ Change room affiliation."""
+        if affiliation not in ('outcast', 'member', 'admin', 'owner', 'none'):
+            raise TypeError
+        query = ET.Element('{http://jabber.org/protocol/muc#admin}query')
+        if nick is not None:
+            item = ET.Element('item', {'affiliation':affiliation, 'nick':nick})
+        else:
+            item = ET.Element('item', {'affiliation':affiliation, 'jid':jid})
+        query.append(item)
+        iq = self.xmpp.makeIqSet(query)
+        iq['to'] = room
+        result = iq.send()
+        if result is False or result['type'] != 'result':
+            raise ValueError
+        return True
 
-	def leaveMUC(self, room, nick, msg=''):
-		""" Leave the specified room.
-		"""
-		if msg:
-			self.xmpp.sendPresence(pshow='unavailable', pto="%s/%s" % (room, nick), pstatus=msg)
-		else:
-			self.xmpp.sendPresence(pshow='unavailable', pto="%s/%s" % (room, nick))
-		del self.rooms[room]
+    def invite(self, room, jid, reason=''):
+        """ Invite a jid to a room."""
+        msg = self.xmpp.makeMessage(room)
+        msg['from'] = self.xmpp.boundjid.bare
+        x = ET.Element('{http://jabber.org/protocol/muc#user}x')
+        invite = ET.Element('{http://jabber.org/protocol/muc#user}invite', {'to': jid})
+        if reason:
+            rxml = ET.Element('reason')
+            rxml.text = reason
+            invite.append(rxml)
+        x.append(invite)
+        msg.append(x)
+        self.xmpp.send(msg)
 
-	def getRoomConfig(self, room):
-		iq = self.xmpp.makeIqGet('http://jabber.org/protocol/muc#owner')
-		iq['to'] = room
-		iq['from'] = self.xmpp.boundjid.bare
-		result = iq.send()
-		if result is None or result['type'] != 'result':
-			raise ValueError
-		form = result.xml.find('{http://jabber.org/protocol/muc#owner}query/{jabber:x:data}x')
-		if form is None:
-			raise ValueError
-		return self.xmpp.plugin['xep_0004'].buildForm(form)
+    def leaveMUC(self, room, nick, msg=''):
+        """ Leave the specified room.
+        """
+        if msg:
+            self.xmpp.sendPresence(pshow='unavailable', pto="%s/%s" % (room, nick), pstatus=msg)
+        else:
+            self.xmpp.sendPresence(pshow='unavailable', pto="%s/%s" % (room, nick))
+        del self.rooms[room]
 
-	def cancelConfig(self, room):
-		query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
-		x = ET.Element('{jabber:x:data}x', type='cancel')
-		query.append(x)
-		iq = self.xmpp.makeIqSet(query)
-		iq.send()
+    def getRoomConfig(self, room):
+        iq = self.xmpp.makeIqGet('http://jabber.org/protocol/muc#owner')
+        iq['to'] = room
+        iq['from'] = self.xmpp.boundjid.bare
+        result = iq.send()
+        if result is None or result['type'] != 'result':
+            raise ValueError
+        form = result.xml.find('{http://jabber.org/protocol/muc#owner}query/{jabber:x:data}x')
+        if form is None:
+            raise ValueError
+        return self.xmpp.plugin['xep_0004'].buildForm(form)
 
-	def setRoomConfig(self, room, config):
-		query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
-		x = config.getXML('submit')
-		query.append(x)
-		iq = self.xmpp.makeIqSet(query)
-		iq['to'] = room
-		iq['from'] = self.xmpp.boundjid.bare
-		iq.send()
+    def cancelConfig(self, room):
+        query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
+        x = ET.Element('{jabber:x:data}x', type='cancel')
+        query.append(x)
+        iq = self.xmpp.makeIqSet(query)
+        iq.send()
 
-	def getJoinedRooms(self):
-		return self.rooms.keys()
+    def setRoomConfig(self, room, config):
+        query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
+        x = config.getXML('submit')
+        query.append(x)
+        iq = self.xmpp.makeIqSet(query)
+        iq['to'] = room
+        iq['from'] = self.xmpp.boundjid.bare
+        iq.send()
 
-	def getOurJidInRoom(self, roomJid):
-		""" Return the jid we're using in a room.
-		"""
-		return "%s/%s" % (roomJid, self.ourNicks[roomJid])
+    def getJoinedRooms(self):
+        return self.rooms.keys()
 
-	def getJidProperty(self, room, nick, jidProperty):
-		""" Get the property of a nick in a room, such as its 'jid' or 'affiliation'
-			If not found, return None.
-		"""
-		if room in self.rooms and nick in self.rooms[room] and jidProperty in self.rooms[room][nick]:
-			return self.rooms[room][nick][jidProperty]
-		else:
-			return None
+    def getOurJidInRoom(self, roomJid):
+        """ Return the jid we're using in a room.
+        """
+        return "%s/%s" % (roomJid, self.ourNicks[roomJid])
 
-	def getRoster(self, room):
-		""" Get the list of nicks in a room.
-		"""
-		if room not in self.rooms.keys():
-			return None
-		return self.rooms[room].keys()
+    def getJidProperty(self, room, nick, jidProperty):
+        """ Get the property of a nick in a room, such as its 'jid' or 'affiliation'
+            If not found, return None.
+        """
+        if room in self.rooms and nick in self.rooms[room] and jidProperty in self.rooms[room][nick]:
+            return self.rooms[room][nick][jidProperty]
+        else:
+            return None
+
+    def getRoster(self, room):
+        """ Get the list of nicks in a room.
+        """
+        if room not in self.rooms.keys():
+            return None
+        return self.rooms[room].keys()