Fixed Trade model so that cards from initiator and receiver are by an association rather than an array, how silly
Updated trade and listed_card models for associating card lists to users in Trade model
Reverted trades model and listed_cards model to previous implementation
Added AwesomePrint gem for pry
Added before_save method to ensure a Trade's cards_from arrays are never nil
Fixed trades controller actions and relevant views to allow for blank trade lists
Wrapped sessions and users new views in styling
Merge branch 'master' of github.com:pschwyter/mtg_json_api

Conflicts:
	app/views/sessions/new.html.erb
	app/views/users/new.html.erb
Added addresses to users