Prevent pre-populating date fields

On the tree detail page, the actions edit->save->edit would cause any
date fields on the page to be populated with the current date. This was
caused by the fact that calling "getDate" on the date picker will always
return a value, even if the text box to which the date picker is
connected is empty.

Fixes #1581
Merge pull request #1586 from jwalgran/topic/prevent-prepopulating-date-fields

Prevent pre-populating date fields
Unlocalize comment id in HTML attribute

Saving threaded comments was failing because id 1000 was being added to
the DOM as "1,000"

Closes #1594
Merge pull request #1597 from jwalgran/fix/threadded-comment-unlocalize-id

Unlocalize comment id in HTML attribute
Add grunt watch task.
Merge branch 'release'

Post-deploy merging of the release branch back into master.
Update user migrator to keep best username
Add CSV endpoint for duplicate user email mgmt
Merge pull request #1601 from steventlamb/topic/migrator_user_management

Topic/migrator user management
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 #1603 from kdeloach/topic/grunt-watch

Add grunt watch task.
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