cleaned file controller, tried private show
access to static files only with url param
filename is uploadid, resolves #20
private raw file view without signature, resolves #17
restrict filetype to png and jpeg, resolves #8

Also I think the filename should not be the upload id. Reopen #20.
Mimetype output is fixed

After 30minutes of debugging I realized I made a typo. Fucking hell.
Restrict access, resolves issue #21
Merge branch 'feature/files-private' into develop
bumped version number
Merge branch 'release/0.2.0'