switched to EMFGeneratorFragment

Change-Id: Id335b67d03c27328bad3b692bf6c1768a7ceb913
Validator in Xtend 

Change-Id: I4a856db3c047051eeab9f6bffdef986ca8975dc5
removed validator helper

Change-Id: I6e59bb645fbb593dd5cd8bd426c997c57c127b1b
adapted to SwtBot 2.2.0

Change-Id: I6c1e3698551d9a4a06e48f5aa2f8f5dda468054e