Work towards not firing so many signals on app approval (bug 879047)
Use BROKER_URL instead of BROKER_* settings.
Merge pull request #794 from diox/fix-guess_features_existing_apps

Overwrite empty app features profiles in update_features
Use DATABASE_URL instead of DATABASE_* settings.
remove unnecessary imports
create models draft (bug 879519)
comment out theme-checksum migration
Revert "comment out theme-checksum migration"

This reverts commit 2145b97d440cecb1646793ee7d91813698c4388c.
fix theme description migration
update template
lower log level on some very common calls
fix margins on "Manage Versions & Status" page (bug 880011)
we have too many tabs on desktop (bug 877472)
Add-ons contest promotion 'Amp your Firefox' (bug 878320)