Added RateIt extension based on the jQuery RateIt library.  See: http://rateit.codeplex.com/
Set cookie on rating submission and lock rating bar if cookie is set
(page refresh, etc)
* Only give feedback to end user on a rating
* Only set readonly on a rating that is successfully recieved
Merge pull request #977 from GawainLynch/features/RateIt

Added RateIt extension based on the jQuery RateIt library.