Populate table view from ShoppingListView.
Create CategoryItems class.
Add shoppingListID to Item class.
Add shoppingListID column into Item table from database.
Add more dummy data.
Merge branch 'bogdan' into sprint2
Delete CategoryItems class.
Add CategoryItem and ShoppingListItem tables.
Add ShoppingListCategory class.
Add plist files for CategoryItem and ShoppingListItem.
Add protocol for Model class.
Add funtionality for adding/removing an item from a shopping list(database + local).
Small changed to add item view.
Merge remote-tracking branch 'origin/bogdan' into sprint2_mircea