Added percentage calculator for TexasPoker. (issue #61)

Added a percentage calculator through brute force simulations (PokerSimulator). Added "test3" Op command to test its functionality. The simulations require optimization since it is still too slow for pre-flop situations. Updated texaspoker.help. Added equals() and hashCode() override for Card. Added a couple new methods to CardDeck and Hand to facilitate the simulator. Updated member method scopes in TexasPoker.
Added percentages for showdowns in TexasPoker. Code cleanup. (Issues #61,#34)

Added percentage calculations for showdowns despite the need for pre-flop calculation optimizations. Replaced regular for loops with enhanced for loops in applicable cases. Added startGame() method to GameManager. Added separator string at the end of test outputs. Added help for "allin" command in blackjack.help.