#27 Ignore groovy timestamp fields

[Emmanuel Bourg]

Groovy generates timestamp fields in the compiled classes, and they always appear as an incompatibility. Here is an example when comparing groovy-1.8.9.jar and groovy-2.1.6.jar :

ERROR: 6001: groovy.beans.ListenerListASTTransformation: Removed field __timeStamp__239_neverHappen1360918004931
INFO: 6000: groovy.beans.ListenerListASTTransformation: Added public field __timeStamp__239_neverHappen1373384431063

I think this incompatibility could be safely ignored, or downgraded to INFO, as it is unlikely to break anything in the real world.