Minor changes. Added documentation.

Added more Javadocs-style documentation. Created variables and accessor methods for help and ini file names. Did some minor code refactoring in Blackjack and Texas Hold'em Poker.
Fixed bug for pair-checking in BlackjackHand.

The refactoring bug was introduced a few commits ago. The logic for pairs was additionally enhanced to include 10s without matching faces. Also added more documentation and code refactoring.