Merge pull request #5 from znagler/decks_and_cards

Decks and cards
Serve assets
Merge pull request #6 from znagler/assets

Serve assets
added signout feature
add decks index controller and view
Write sql query to return most recent versions of
each of a users decks
Merge branch 'master' of https://github.com/znagler/flashforward into decks_and_cards