Initial features 4 (#5)

* Select works fine

* Context switching works

* Going to expand fns

* Diff and value

* Progressing

* fix click events

* highlight code

* Add revision age info

* Values diff

* remove forgotten

* Refactor data layer, add flag

* UDV flag works

* Diff with prev works

pkg/dashboard/static/styles.css

@@ -6,6 +6,6 @@
     color: white!important;
 }
 
-.d2h-file-header {
-    display: none;
+.d2h-file-collapse, .d2h-tag {
+    opacity: 0; /* trollface */
 }