allow passing of mime-type and content to FileResponse directly - necessary for pre OC6 where no \OC\Files\Node\File exists
define new routes for cover and track download:
/api/album/{albumIdOrSlug}/cover
/api/file/{fileId}/download
Merge branch 'master' into download-url-by-fileid
no need to resolve the path
fix unit tests
Cleanup file info SQL statements - in favor of new cover/file handlers
close the session to enable parallel requests to be processed
fix unit tests for changed URLs
add @method annotation
Merge pull request #207 from owncloud/download-url-by-fileid

Download url by fileid