Add scaffolding for Hand model.

A Hand record will contain references to the Player owning the hand,
the Round in which the Hand existed in, and the WhiteCards making up
the Hand in that Round.
Add .yardoc folder to ignore list.
Add associations to Hand model.

The following associations were added to the Hand model:
 belongs_to :player,
 belongs_to :round,
 has_many   :cards
Add scaffold for Round model.

The Round model will represent an individual round that takes place
inside a Match. At the start of a Round, the BlackCard Player will
draw the BlackCard for this Round. The WhiteCard Players will then
make Plays based off of the drawn BlackCard.
Add scaffold for Hand model.

The Hand model will represent the collection of private WhiteCards a
Player owns during a specific Round.
Add scaffold for Match model.

The Match model will represent a single game session. It is technically
a joinning of all events and objects that happened and were created for
the purpose of completing the session.
Add scaffold for MatchHistory model.

The MatchHistory model will represent the collection of Matches a
Player has through their lifetime.
Add FactoryGirl Rails gem.
Fix MatchHistory user_id -> player_id.