Merge branch 'right-sidebar-link-hover' into 'master'

Fixed colour of dropdown link hover

![Screen_Shot_2016-04-07_at_16.02.40](/uploads/bfbfa5d1b82576b6bafaefd567effa06/Screen_Shot_2016-04-07_at_16.02.40.png)

See merge request !3596

app/assets/stylesheets/pages/issuable.scss

@@ -263,6 +263,12 @@
     }
   }
 
+  .dropdown-content {
+    a:hover {
+      color: inherit;
+    }
+  }
+
   .dropdown-menu-toggle {
     width: 100%;
     padding-top: 6px;