Get app ready for Heroku deployment.

Add SSl to production configuration.
Add postgress and 12 factor gems.
Move sqlite3 gem to test/development.
Add logic to handle a user not logged in.
Add deck view and initial styling
Add a new deck to db/seed.rb.
Add deck index view.

Use a jquery click method to listen for clicks on the .deck div class
to link each deck to the deck view.
Add show view for decks.

Change `@decks` to `@deck` and add `@cards` instance variable to the
controller.
Add Conditional deck label added to the button group.
Add styling for the label.
Change the class of the decks in the decks index view from `.deck` to
`.deck-big`.
Change the way the click event works on decks.

The original listener would also listen to clicks on the buttons.
Instead the listener now listens to clicks on the `goto` class which is
a child approximately 82% the size of its parent.
That's right, I'm using a goto statement.
For more information see: http://xkcd.com/292/