[DRAFT] OGG support
MOAR CONVERSION DRAFT
Removed unused properties
Better docstrings
/convert without mimetype converts all
Forgot the converter
MOAR PARAMS TO FFMPEG
Fixed Last.FM integration
Replaced JSONResponse(404) with abort(404)

When a 404 was encountered, the JSONResponse object was trying to be
marshalled. The abort function, on the other hand, raises an Exception,
aborting the execution of the script.