AsyncTask and ListView display movies

Do HTTP requests in asynchronous background task. ListView now displays
recommended movies parsed from JSON response. Fixed view XMLs
Added Gson library
Asynchronous tasks for getting movie, movies, and rating a movie
Updated strings and xml layouts
Two ListFragments and RateMovieActivity

Two fragments that display lists of movies; one displays recommended
movies and the other displays movies a user has rated. A new activity
allows user to rate a given movie.