Episode 1 Assignments

Hey there

This is my first pull request for a ruby off rails course so wasn't exactly sure if I should submit one big pull request with all three sections of the assignment complete or one each.

So here are my solutions for the Panda, Tiger and Eagle sections of the assignment.

For the eagle section I struggled to work out if it was the Game or the Hand's responsibility to hide the dealers card but ended up creating a DealerHand class to reduce the logic in Hand and to split up the testing for the dealer specific tasks.