bug check Singular
Merge branch 'master' of
https://github.com/genericsystem/genericsystem2011.git

Conflicts:
	genericsystem-impl/src/main/java/org/genericsystem/core/GenericImpl.java
	genericsystem-impl/src/test/java/org/genericsystem/impl/MapTest.java
bug check singular in map
Merge branch 'master' of
https://github.com/genericsystem/genericsystem2011.git

Conflicts:
	genericsystem-impl/src/main/java/org/genericsystem/core/CacheImpl.java
	genericsystem-impl/src/main/java/org/genericsystem/map/ConstraintsMapProvider.java
merged
Merge branch 'master' of https://github.com/genericsystem/genericsystem2011.git
clean log in test
Merge branch 'master' of https://github.com/genericsystem/genericsystem2011.git
implements propertyConstraint in map
Merge branch 'master' of
https://github.com/genericsystem/genericsystem2011.git

Conflicts:
	genericsystem-impl/src/main/java/org/genericsystem/core/EngineImpl.java
	genericsystem-impl/src/main/java/org/genericsystem/core/GenericImpl.java