Issue #7  facilitate custom NoSQL storage 
- Metaclass\TresholdsGovernor\Manager\RdbManager added 
- ReleasesManagerInterface added
- RequestCountsManagerInterface added
- TresholdsGoverner from all functions factored out Manager\RdbManager
functions 
	>>requestCountsGateway renamed to requestCountsManager
	>>releasesGateway renamed to releasesManager
	::__construct now expects a dataManager instead of a DbalGateway
- DbalGateway::insertOrUpdateCounts renamed to ::insertOrIncrementCount
- TresholdsGovernorTest::testDeleteData1, ::testDeleteData2 now gets
>>requestCountsManager, >>releasesManager
	::testPackData now uses RdbManager, >>requestCountsManager,
>>releasesManager