Merge branch 'master' of https://github.com/cpoulain/codalab
Merge branch 'master' of https://github.com/cpoulain/codalab
Merge branch 'master' of https://github.com/cpoulain/codalab
Merge branch 'master' of https://github.com/codalab/codalab
Merge branch 'master' of https://github.com/cpoulain/codalab
Merge branch 'master' of https://github.com/codalab/codalab
Create timezone-aware datetime objects for issue #317.
Add basic submissions administration
Add missing header and title to participants view
Merge pull request #392 from cpoulain/master

Create timezone-aware datetime objects for issue #317.
Add support for sorting submissions in admin page
Reorder columns on submissions page
Merge pull request #393 from javierluraschi/AdminImprovements

Administrator Interface - Add submissions page with sorting (See #371)