Changes supervision api and frontend to use SNAPSHOT
Fix for UTF-8 encoding bug

Switched to hacked version of apache-mime4j which allows us to recover the uploaded bytes properly.  Added an interceptor to tell resteasy to default to utf-8 rather than us-ascii when no charset is given
Refactored code to build users list so we don't have a trailing comma
Removed throwing of raw Exception class and attempted to delete the file if we fail to write it
Removed throwing of raw Exception classes