Minor improvements.

- Refined getComparator() in Record class
- Added more support for String values in Record class
- Renamed default config file to 'casinobot.conf'
- Updated documentation in PokerHand class
Improved management of game settings.

- Changed game settings to use Record instead of HashMap
- Settings now support double, boolean, and string values as well
- Updated CasinoBot config with changes made in Record for game settings