fix app serialization in feed coll list view
Update .baked to include as much stuff as possible (bug 1021205)
Move apps/users/ to mkt/users/ (bug 1021205)
Merge pull request #2180 from diox/mv-users

Move apps/users/ to mkt/users/ (bug 1021205)
Hide validator tracebacks (bug 1023983)

Don't serve a 500 if the appvalidator fails when celery is eager.
Close #2189
Bump app-validator (bug 1023490)