another synchronization check on result retrieval.
Removed unused arguments and file paths.
Change submission signaling to use post_save
Enable competitions to allow auto-registration.
Fix packaging of results when executed locally.
Merge branch 'master' of https://github.com/codalab/codalab.git
Merge branch 'umaster'
Removed dead code.
Merge pull request #292 from irjudson/master

2 in 1: Competitions without registration, Leaderboard configuration fixes (aggregate / computed columns added)