Implemented JSON parsing, adjusted classes.

Implemented the JSON parsing to scrape the JSON file generated by the
Sodexo Menu Parser written in Python in Spring 2014 by myself and Dan
Baek. Added template fragment class to contain the food items list
pertaining to a specific dining hall. Adjusted and added DiningHall and
FoodItem model classes to represent a dining hall and meal (such as
cheeseburger) respectively. ListView displaying all dining halls now
complete and working.