adapted tests
added processing for validation change
Merge remote-tracking branch 'origin/f-configuration-manager' into f-configuration-manager

Conflicts:
	Yodii.Model/ConfigurationLayer.cs
Finished ConfigurationManager

Todo : implement tests and interface of collection
Merge branch 'f-configuration-manager' into f-discoverer-spi

Conflicts:
	Yodii.Model/Configuration/ConfigurationItem.cs
	Yodii.Model/Configuration/ConfigurationLayer.cs
	Yodii.Model/Configuration/ConfigurationManager.cs
	Yodii.Model/Configuration/ConfigurationStatus.cs
	Yodii.Model/Configuration/FinalConfiguration.cs
	Yodii.Model/Configuration/FinalConfigurationItem.cs
	Yodii.Model/ConfigurationLayer.cs.orig
	Yodii.Model/Yodii.Model.csproj