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
Merge pull request #410 from elcodi/feature/upload-image-rich-response

Added some useful information to image upload resp