Issue #9 cross framework library refactoring
- Moved TresholdsGovernor, RequestCountsRepository to
metaclass-nl/tresholds-governor repository
- UsernamePasswordFormAuthenticationGuard now uses
Metaclass\TresholdsGovernor\Service\TresholdsGovernor
	::attemptAuthentication now expects
TresholdsGovernor::checkAuthentication to return null 
		or a Metaclass\TresholdsGovernor\Result\Rejection and throws
corresponding exception 
- Tests\Service\TresholdsGovernorTest moved actual tests to
metaclass-nl/tresholds-governor repository,
	added delegations to
Metaclass\TresholdsGovernor\Tests\Service\TresholdsGovernorTest
-  Resources/config/services.yml adapted
- composer.json adapted
- documentation adapted