Add card, delete card, delete deck

Users can now add cards, specifying their title, deck and taboos
Users can also opt to delete a card using their title and deck as keys
Users can also delete entire decks using the deck name as a key

TO DO:
1) Have spinners populated whenever action is taken
2) Populate text fields on spinner selection
3) Reset text fields on successful add or delete
4) Give alert dialog confirmation on successful add and delete