Small changes in texaspoker.HouseStat.

- Simplified getToStringList().
- Added error checking for getDonorsString() and getWinnersString().
Added usage of diamond operators (issue #144).

- Added usage of diamond operators (Java 7)
- No longer compatible with Java 6
Add try with resources (issue #144).

- Changed all file I/O try statements to try with resources (Java 7)
- Slightly changed the behaviour of loadPlayerFile() and savePlayerFile()
  in CardGame
- Updated bot logging to use a more readable format
- Other minor changes
Minor changes.

- Added equalsIgnoreCase() String comparison in Player (issue #137)
- Minor changes in CasinoBot