Merge pull request #189 from christeredvartsen/prioritize-original-image-mime-types

Prioritize original image mime types when doing content negotiation
Removed whitespace
Added a ShortUrl resource and a test case
Added methods related to the short URL
Removed custom method for fetching the access token URI
Skip access token check if a valid short URL is present in the response headers
Added an entry for the new resource
Only test definitions related to the resource under test
Created a route for the short URL, and create an entry for it in the container
Added schema for the shorturl table for MySQL, and fixed the Doctrine test to use a compound key
Added a feature file for short URLs
Added some custom assertions
Added some methods matching some feature definitions
Added a scenario regarding short URLs
Make sure the defaults are the same as before
Removed the collectionName parameter of the MongoDB database driver
Removed extension from the short URL route and added some tests. Also updated dependencies
Use Background to add the image