Extract ajax upload and destroy_upload actions from images and documents controllers and place them at new controllers to manage direct uploads

app/assets/javascripts/application.js

@@ -64,6 +64,7 @@
 //= require flaggable
 //= require documentable
 //= require imageable
+//= require direct_uploads
 //= require tree_navigator
 //= require custom
 //= require tag_autocomplete