Implements a breadcrumb for normal wiki pages. Resolves #629.

lib/gollum/public/gollum/stylesheets/gollum.scss

@@ -34,6 +34,7 @@ a {
   margin: 1em 0 0;
   padding: 0;
   overflow: hidden;
+  width: 100%;
 
   @include desktop-breakpoint {
     border-bottom: $border-standard;
@@ -46,7 +47,7 @@ a {
     float: left;
     line-height: normal;
     margin: 0;
-    margin-top: 2em;
+    margin-top: 3em;
     padding: 0 0 0 0.667em;
 
     @include desktop-breakpoint {
@@ -54,6 +55,16 @@ a {
       padding: 2px 0 0 0;
     }
   }
+  
+  div.breadcrumb {
+    margin: 0;
+    padding: 0;
+    position: absolute;
+    margin-top: 3.5em;
+    float: none;
+    overflow: auto;
+    font-size: 1.5em;
+  }
 
   ul.actions {
     clear: both;