* fixed stanza.keys()

sleekxmpp/xmlstream/stanzabase.py

@@ -77,6 +77,7 @@ class ElementBase(object):
 		out += [x for x in self.plugins]
 		if self.iterables:
 			out.append('substanzas')
+		return tuple(out)
 	
 	def find(self, item):
 		return self.iterables.find(item)

tests/pubsub_stanzas.py

@@ -16,6 +16,9 @@ def testAffiliations():
 	values = iq2.getValues()
 	print(values)
 	iq3.setValues(values)
+	print("-"*8)
+	print(iq3.keys())
+
 	print(iq3)
 	print(str(iq) == str(iq2) == str(iq3))