Generate Deck Model and add associations.
Add a CardDeck model.

`bundle exec rails generate model CardDeck card:references
deck:references`
Change Active Record Associations.

Change from `belongs_to :user` to `belongs_to :creator, class_name: "User"`.
Updated schema from running migration.
Add the jazz_hands gem for pry and hirb integration.
Fix type for model relation.
Add `has_many :decks' relations to User model.
Add tests for Deck model.
Add 'has_many :card_decks` to Card and Deck models.
Add passing tests for the CardDeck model.
Generate Tag model and tests
Generate card_tags join table and associations
Generate CardTags model, associations, and tests
Fix card_tag model name
Merge pull request #4 from BlackCardWhiteCard/model/deck

Deck and Tags models