Fix offset when jumping to anchors

Fixes #583

html/index.html.erb

@@ -52,6 +52,11 @@
     .navbar, .navbar .brand, .navbar a, .navbar .nav>li>a {
       color: #922793;
     }
+    a[name] { /* Stop navbar from hiding anchors */
+      padding-top: 60px;
+      margin-top: -60px;
+      display: inline-block; /* required for webkit browsers */
+    }
   </style>
   <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js" type="text/javascript"></script>
   <script src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/js/bootstrap.min.js"></script>
@@ -99,7 +104,8 @@
       </div>
     </div>
     <section>
-      <h2 id="packages">Current List of <%=h packages.size %> Packages</h2>
+      <a name="packages"></a>
+      <h2>Current List of <%=h packages.size %> Packages</h2>
       <table class="table table-bordered table-hover">
         <thead>
           <tr class="header">
@@ -129,7 +135,8 @@
       </table>
     </section>
     <section>
-      <h2 id="installing">Installing</h2>
+      <a name="installing"></a>
+      <h2>Installing</h2>
       <p>To add the repository put this before the call to <code>package-initialize</code> in your <code>init.el</code> file.</p>
       <!-- <script src="https://gist.github.com/1679158.js"> </script> -->
 
@@ -139,7 +146,7 @@
         Please read about <a href="#known-issues">known issues</a>
         below before attempting to install multiple packages at once.
       </p>
-      <h3 id="customizations">Customizations</h3>
+      <h3>Customizations</h3>
       <p>
         There is currently no way in <code>package.el</code> to
         exclude or include versions. So to remedy this there is
@@ -188,7 +195,8 @@
       </dl>
     </section>
     <section>
-      <h2 id="known-issues">Known Issues</h2>
+      <a name="known-issues"></a>
+      <h2>Known Issues</h2>
       <p>
         <strong>Note:</strong> <em>These fixes are included in
         the <code>melpa.el</code> package.</em>
@@ -206,7 +214,8 @@
     (print requirements))</code></pre>
     </section>
     <section>
-      <h2 id="updating">Updating Packages</h2>
+      <a name="updating"></a>
+      <h2>Updating Packages</h2>
       <p>
         <code>package.el</code> now includes a mechanism to upgrade
         packages. After running <code>package-list-packages</code>,
@@ -221,7 +230,8 @@
         and delete packages that are installed multiple times. This
         can happen when the install times out.
       </p>
-      <h2 id="development">Development</h2>
+      <a name="development"></a>
+      <h2>Development</h2>
       <p><a href="https://github.com/milkypostman/melpa">https://github.com/milkypostman/melpa</a></p>
       <p>
         Contributions are welcome. Currently, the builder supports