Merge pull request #11 from pamelawang/pam-in-progress

getCellAt() in Player.java and ComputerPlayer.java
Things are working! Finished testing up to Player. Have adjusted for indexing and cell color.
Merge pull request #12 from pamelawang/meera

Finished testing up to Player.
Got the error working. Figured out loop for game.
InvalidShotException working, got a game loop going.
Shit ain't working.
Maybe shit will work.
Merge branch 'master' into pam-in-progress