Add layout to compare revisions page

lib/gollum/frontend/templates/compare.mustache

@@ -1,19 +1,13 @@
-<div class="guide">
-  <div class="main">
-    <div class="actions">
-      <a href="/{{escaped_name}}">&laquo; Back</a>
-    </div>
-    <h1>{{title}}: {{before}} &rarr; {{after}}</h1>
-    <div id="files">
-      <div class="file">
-        <div class="meta">
-          <div class="info">
-            <span class="icon">
-              <img alt="Txt" height="16" src="/images/txt.png" width="16">
-            </span>
-            {{path}}
-          </div>
+<div id="wiki-wrapper" class="compare">
+<div id="head">
+  <h1>History for <strong>{{path}}</strong></h1>
+  <ul class="actions">
+    <li class="minibutton"><a href="/history/{{escaped_name}}"
+       class="action-page-history">Back to Page History</a></li>
+  </ul>
+  {{>searchbar}}
 </div>
+<div id="compare-content">
   <div class="data highlight">
     <table cellpadding="0" cellspacing="0" width="100%">
       {{#lines}}
@@ -28,6 +22,10 @@
     </table>
   </div>
 </div>
+<div id="footer">
+  <ul class="actions">
+    <li class="minibutton"><a href="#">Back to Top</a></li>
+  </ul>
 </div>
 </div>
 </div>