Add rakefile for RSpec
Add spec for Card class
Add card class with render function
Update card class and spec so that things actually work
Make card suit and rank readable across classes
Add deck spec that tests collect suit
Add deck class with #collect_suit

Deck#collect_suit is a convenience function to gather all
cards of a single suit in the deck.
Extend deck specs for #build_deck function
Add #collect_rank convenience function
Change how rank is stored on cards

Switched to using a conversion hash to convert numbers to rank
strings.
Add function to build a new deck
Write spec for shuffle and then implement
Write spec for Deck#deal_card and implement
Define basic outline of hand spec
Create hand class. Begin logic around winning hands
Add logic about hands
Add function that determines best hand