Issue #8 limit dependencies from Doctrine to DBAL
- TresholdsGovernor now uses RequestCountsRepository instead of the
entity
	::__construct now instatiates RequestCountsRepository
- RequestCountsRepository no longer extends EntityRepository
- Entity\RequestCounts removed
! the usage of an EntityManager is still causing dependency on ORM
Issue #8 limit dependencies from Doctrine to DBAL
- RequestCountsRepository::__construct now expects a
Doctrine\DBAL\Connection
	::getConnection added
	replaced $this->getEntityManger()->getConnection() by
$this->getConnection()
- TresholdsGovernor now uses Doctrine\DBAL\Connection instead of
EntityManager
	__construct now expects and stores Connection
- services.yml replaced service
metaclass_auth_guard.entity_manager_login by
metaclass_auth_guard.connection_login
- Configuration::getConfigTreeBuilder now defines db_connection instead
of entity_manager_login
- MetaclassAuthenticationGuardExtension::load now sets parameter
metaclass_auth_guard.db_connection.name instead of
entity_manager_login.name
- security.yml now:
    metaclass_authentication_guard:
        db_connection:
            name: login
- composer.json replaced dependency "doctrine/orm": ">=2.2.3,<2.4-dev",
by "doctrine/dbal": "2.3.*",
! "doctrine/doctrine-bundle" has require-dev  "doctrine/orm"