Added GaspServerAPI and AddRestaurantFragment/Test classes
Gasp shared preferences default values loaded as @string
Added abstract GaspEntityTest and refactored GaspRestaurantTest/GaspReviewTest
Renamed GaspRestaurant/GaspReview Fragments
Added deleteGaspEntity to GaspServerAPI
Added @Expose methods to Review model class
Added Javadoc and comments to GaspEntity Test, Fragment and ServerAPI classes