refactored crontabber to use transaction_executors
rewrote mixins.py - refactored all crontab apps

Conflicts:
	socorro/cron/jobs/bugzilla.py
pep 8 & pyflakes cleanup
Merge pull request #1745 from twobraids/crontabber-transaction

fixes Bug 950735 (v78) -  refactor crontabber to use the transaction_executor
Fixes bugs 978098, 978100, 978102, 974084 - Use query string parameters in the middleware and the webapp. r=peterbe
fixes bug 981034 - LagLog crontabber app is failing after new crontabber refactor
Merge pull request #1932 from peterbe/bug-981034-laglog-crontabber-app-is-failing-after-new-crontabber-refactor

fixes bug 981034 - LagLog crontabber app is failing after new crontabber refactor
fixes bug 847982 - paginate comments on report list, r=AdrianGaudebert
fixes bug 977965 - Sort bug IDs per crash signature alphabetically, r=AdrianGaudebert
fixes bug 974726 - implement correlations using postgres
whitespace
remove correlations from backfill_matviews
migration