Places cards in a spiral.

Squashed commit of the following:

commit 973e0e9b9ced5ee482282ecb6c64b997a6237db2
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sat Dec 7 14:53:07 2013 -0600

    Places cards in a spiral.

commit f73ecdea26e9bcc99682660fbcfac39349958184
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sat Dec 7 14:19:18 2013 -0600

    Reduces layers, removes styles, refactors px addition in JavaScript.