A few changes to fit rails 4.1.0. + monologue_image_upload usage

We had issues to make this gem works properly with monologue_image_upload in a rails 4.1.0 environment.

So we changed the ckeditor version needed from 4.0.11 to 4.1.0 in monologue.gemspec.
We also changed a line in app/assets/javascripts/monologue/admin/application.js to fit the ckeditor version modification.

Enjoy.