feature request: return mutable bitmap

your library works very nicely, but while trying to use it in my app, i had a need to further manipulate the bitmap returned from the crop. unfortunately, since the returned bitmap is immutable, i had to copy it to another mutable bitmap.
if it would be possible to add an options flag to make the returned bitmap mutable, that would help a lot.

also, making BitmapUtils public would help as well. for instance to manipulate the bitmap as above and then write it to a URL as is done in BitmapCroppingWorkerTask.

thanks,
itay