Moved contrib apps to contrib.py settings
Optional user email field in comment form
Add threaded comments display
Enable Ajaxy support for commenting
Enable Ajaxy reply-to comment
Merge branch 'master' into comments_fixes

Conflicts:
	django_project/imagery_requests/views.py
	django_project/web/static/css/custom.css
Merge pull request #51 from dodobas/comments_fixes

Comments fixes