setting content type to JSON for http PATCH

Updating OperationView.coffee to add JSON content type for PATCH 
similar to POST and PUT so that the newly added PATCH works fine

src/main/coffeescript/view/OperationView.coffee

@@ -78,7 +78,7 @@ class OperationView extends Backbone.View
         complete: (data) =>
           @showCompleteStatus(data)
 
-      obj.contentType = "application/json" if (obj.type.toLowerCase() == "post" or obj.type.toLowerCase() == "put")
+      obj.contentType = "application/json" if (obj.type.toLowerCase() == "post" or obj.type.toLowerCase() == "put" or obj.type.toLowerCase() == "patch")
     
       jQuery.ajax(obj)
       false