Fix javadoc maven compilation
Remove Constraints from API
Merge
Merge branch 'dev' of
https://github.com/genericsystem/genericsystem2014.git into dev

Conflicts:
	gs-api/.settings/org.eclipse.jdt.core.prefs
	gs-api/src/main/java/org/genericsystem/api/core/IVertexBase.java
	gs-impl/src/main/java/org/genericsystem/impl/IEngine.java