Comments

Comments for SciPy Central built over `django.contrib.comments`

1. Asynchronous comment submission using jQuery
2. support for flagging comments - email is sent to `CommentModerators` user group
3. Rss Feed of latest 40 comments in the site
4. Rss Feed of comments for individual revision object
5. Gravatar support

Note:
1. django.contrib.comments.views have to be overridden for Ajax support
2. Reputation for comments is attached in the `Thumbs` branch. It has to be updated once this is merged!