Eregrith

For what it's worth : I've been digging around in `Upload.upload`'s source code and found out this: https://github.com/danialfarid/ng-file-upload/blob/d911c553d0c1be76276a3b50ad5e3e8345c91747/src/upload.js#L153-L165 This is the deffered's promise that is returned when calling `Upload.upload`, so...

@tomakita Are you planning to expose a capability-test function to clients of the lib? It would be useless to allow 256 colors but not tell the dev if more than...