[bug 935498] Remove Mozilla News section.
[bug 932645] First approved revision is of MAJOR_SIGNIFICANCE.
[bug 920922] Remove sr-Latn locale.

* Moves sr-Latn user profiles to sr-Cyrl
* Deletes sr-Latn documents
* Deletes sr-Latn locale team
* Deletes sr-Latn images and videos
* Deletes sr-Latn wiki metrics
[bug 673947] Use display name on discussion forums
[bug 932348] Escalate questions to zendesk when tagged "escalate".
[bug 937183] @require_POST for logout view.
[Bug 915686] Rickshaw: Add toggles to mini legends.
[bug 933474] FF download button warning message
[bug 940311] Check if updated_by is set before using.
Undo accidental django-badger downgrade.
[bug 928359] Run unindex tasks after deleting users from cron job.
[bug 907660] Add log for user deactivations
[bug 931748] Fix question traffic stats cron
[bug 943464] Add reconciling to reindexing

Our existing reindexing code would update the index with db contents,
but it never checked the index to see if the index had documents in it
that weren't in the db.

This adds reconcilation code that removes things from the index that
shouldn't be there.

This also tweaks the admin page for index maintenance and adds an
outstanding records section making it easier to see what's going on and
also easier to see what happened.
|Bug 944344] Linkify usernames in deactivation log
[bug 944815] Fix unicode fail in escalate.
rebuild_kb twice a day instead of 4 times.
Move questions config things into config.py

from question_config.py and __init__.py.
[bug 936718] Implement infra for question statuses.

* Adds model manager to get questions with the following status:
** DONE
** RESPONDED
** NEEDS ATTENTION
** NEEDS INFO
** ESCALATED
* Adds helper to question model for setting and unsetting NEEDS_INFO.
[bug 939164] Fix product/topic edit form when one is missing.