Implement P4::Chips.game_results_valid?
Remove unused yaml require
Move require to spec_helper
Add database cleaner
Refactor move shared code from chips_spec to spec_helper
Implement Balance model
Implement TransactionGain model
Implement TransactionLose model
Refactor Balance.free
Minor refactor
Minor Chips refactor
Refactor P4::Chips.configure - remove db connection est