Include highlight.js assets

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Former-commit-id: c7966a42

app/assets/javascripts/application.js

@@ -24,6 +24,7 @@
 //= require g.raphael-min
 //= require g.bar-min
 //= require branch-graph
+//= require highlightjs.min
 //= require ace-src-noconflict/ace
 //= require_tree .
 //= require d3

app/assets/stylesheets/application.scss

@@ -5,6 +5,7 @@
  *= require jquery.ui.gitlab
  *= require jquery.atwho
  *= require select2
+ *= require highlightjs.min
  *= require_self
 */