@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.
Can we put a space between `card:` and `CTFCard?`? It's how Apple has it in all their sample code and I'd like to be consistent.