Improvement of model for Product and Product Versions
Removed non permitted annotation
Fixed mapping
Fixed annotation
Merge remote-tracking branch 'avibelli/master' into HEAD

Conflicts:
	pnc-model/src/main/java/org/jboss/pnc/model/BuildCollection.java
	pnc-model/src/main/java/org/jboss/pnc/model/Product.java
	pnc-model/src/main/java/org/jboss/pnc/model/Project.java
	pnc-model/src/main/java/org/jboss/pnc/model/ProjectBuildConfiguration.java
Merge pull request #28 from slaskawi/fix_merge

Fix merge