@ashfurrow => Card Handling

Added a RAC layer on top of CardFlight's SDK.

It creates a stream that passes messages through, then if it's successful it completes and you're expected to take the Card from the handler, in-between it send strings through telling you what it's doing.
Surprised this didn't give a compiler error. Since you're subclassing `NSObject`, it's a good habit to call `super.init()` after setting up instance properties.