Minimum bet in Craps > 0

http://gamecorner.info/Thread-Casino-Game-errors?pid=1375#pid1375

Betting 0 or negative number of coins messes up your total number of coins when you win or lose in Craps.
Minimum bet in Craps > 1

Changed the minimum bet amount so that users cannot bet 0 or negative numbers.
Merge pull request #10 from JotG1337/patch-2

Minimum bet in Craps > 1