open theme detail page for pending themes (bug 850333)
allow theme artists to upload new header and footer graphics (bug 851881)
create queue for re-reviewed themes (bug 851882)
report that browserid is disabled
more tests, more http methods for payment accounts (bug 869553)
Merge pull request #721 from ngokevin/themereupload

allow theme reuploading (bug 851881), theme rereview queue (bug 851882)
Merge pull request #747 from ngokevin/pendingthemedetail

open theme detail page for pending themes (bug 850333)
fix dup migration
fix theme commit test on jenkies
move out of the second transaction (bug 871834)
Upgrading celery and dependent libraries (bug 825938)

Note: Don't merge until the backend is ready to upgrade rabbitmq.
Celery now requires billiard
return the correct permissions for /account/login/ API endpoint (bug 871841)
Add AppFeatures to app submission and update flows (bug 858306, 862444)
Give qHD a friendlier name