Rotten Tomato Movie Ratings

**User Story:** As a Plex for Roku user I would like to be able to see the Rotten Tomatoes ratings for each movie to aid in deciding which movie to watch.

I have added the ability to enable movie ratings from the Rotten Tomatoes API via a plex preference.  If the preference is enabled, the app will make an HTTP request to the Rotten Tomatoes API with the movie title as an argument.  The API will return a JSON string full of information for that movie title if it matches a movie in their database.

Here are some screenshot of the feature in action.

*Enabling the preference*
![Enabling the preference](http://i.imgur.com/UuOWfKa.png)

*Viewing a movie and its rating*
![Viewing a movie and its rating](http://i.imgur.com/XeiFW8j.jpg)

*Selecting the rating to view more information*
![Selecting the rating to view more information](http://i.imgur.com/DkbJkWh.jpg)

*Viewing a movie when client-side delete is enabled*
![Viewing a movie when client-side delete is enabled](http://i.imgur.com/iA1pBoS.jpg)


This is my first attempt at Brightscript (wish it was Python!), so please feel free to go hard on me in the review.  I will be happy to make any revisions necessary before merge, if it is accepted as a feature.