add in migration (bug 859560)
skip flaky TestReviewTransaction.test_public_sign_failure test
So let it be written, so let it be CORSed

Ratings APIs need to be CORSed.
Added CORS tests for @mattbasta's commit 6d51aa20
Fixed CORS tests
catching the monolith server errors
Added the old_version flag.

You can use this flag to get the old data in the json/csv views.
That's useful to compare data on the fly between the monolith-based
metrics and the old metrics.
deactivating metrics caching
enable the ALLOW_TASTYPIE_SERVICES flag in staging
Filter apps based on our adult/child flags (bug 852567)