do not traceback because we are trying to add the app to the same category again (bug 855245)
reapply doc fix
we renamed "devhub.personas.submit" url to "devhub.themes.submit"
make theme deletion work (bug 855247)
queue for flagged themes (bug 841195)
Merge pull request #699 from ngokevin/flagtheme

queue for flagged themes (bug 841195)
replace settings.PERSONA_PATH with settings.ADDONS_PATH (bug 846957)
add some padding between meta labels in theme review tool (bug 855479)
Add API endpoint for submitting site feedback (bug 846847)