add link to new deck for logged in user on decks show page, add new route in decks, add new file in views
adjust route for newdeck creation, and first card
user create new deck, redirect to deck_display page, begin to add cards
last before new master
Merge branch 'master' into user_gen_new_deck
adding signup merge
Merge branch 'master' into user_gen_new_deck
Merge branch 'user_gen_new_deck'