Move processing functions out of mgmt command

The less logic we keep trapped in a management command, the better.
Roll comment and threadedcomment to shared base
Merge pull request #1606 from steventlamb/topic/refactor_comment_migrator

Topic/refactor comment migrator
Fix circular import via lazy translation

EnhancedThreadedCommentFlag inherits from Auditable, which was importing
ugettext, which imports all models, including
EnhancedThreadedCommentFlag, which created a circular import. This is ok
in runserver, but crashes gunicorn. (I was able to get a stack trace
from gunicorn by editing the upstart job to include the --debug flag)
Merge pull request #1608 from jwalgran/topic/fix-circular-import-in-comment-mod

Fix circular import via lazy translation
Clean up comment moderation page

Fix filter dropdown
Change indentation to 2 spaces to match other HTML
Move comment moderation views from treemap into otm_comments
Enable pagination on comment moderation
Add filtering to comment moderation
Add sorting to comment moderation
Replace fake flag count with actual flag count
Comment out Flagged by sections temporarily
Fix sass indentation (had mixed tabs and spaces)
Fix comment styling and wire up less/more link
Add UI tests
Merge pull request #1607 from maurizi/comment-moderation-js

Comment moderation js