Issue #10 api docs
- TresholdsGoverner completed api docs
- Result\Rejection is now an abstract class
- Result\Rejection and subclasses completed api docs
- Gateway\DbalGateway \DataTime parameter type hints added, completed
api docs
- Manager\ReleasesManagerInterface \DataTime parameter type hints added,
completed api docs
- Manager\RequestCountsManagerInterface \DataTime parameter type hints
added, completed api docs
- Manager\RdbManager \DataTime parameter type hints added, completed api
docs