Added some useful information to image upload resp

* Refactored the controller. Placed all the upload logic inside a new service
* Changed the tests to make it happen
* Changed the default field name of image to "file". Previously was "image"
* Added some useful (and elcodi related) response data in the upload response
    * resize route wildcarded
    * view route wildcarded
Completely agree with you on that. Let's open a new issue for that :)

Thanks @xphere