Fixes bug 968493 Scrape update_channel information into raw_update_channel for b2g
* Add new tables for update_channel
* Adds update_raw_update_channel() and backfill commands
* Make it possible to run the update_raw_update_channel() multiple times
* Add crontabber job
* Make rewrite rule a JSON type
Migration for bug 968493 add raw_update_channels and friends
fixes bug 969062 - Return more descriptive 4xx errors in JSON, r=AdrianGaudebert
fix bug 970687 - pass beta to correlations form, strip it out before
passing to service
Merge pull request #1873 from rhelmer/bug970687-correlations-beta-not-working

fix bug 970687 - pass beta to correlations form, strip it out before
Adds fakedata and corrects typo in models.py r=rhelmer
Merge pull request #1866 from selenamarie/bug968493-scrape-release-info

Bug968493 scrape release info
fixup crash_data service in the middleware
Merge pull request #1795 from twobraids/refactor-priority

fixes Bug 948533 (v74) - refactor CrashData and Priorityjobs middleware services