First commit of the ocl validation plugin, that contains OCL to EMF
constraint wrappers.
Avoiding the pickers to be re-created (getPickers return a collection
instead of an iterable)
Add Commit error messages
Bug Correction on ElementTypeConfigurationPage content provider (hack)
add !=null verification
Merge branch 'master' of https://github.com/aradouan/ReqCycle into develop