Revert "upgrade to groovy 2.0"
Revert "upgrade to groovy 2.0"

This reverts commit 8dcb1c18e95beb05d975f7c51d871b7dadaa7c37.

gradle/gradle,robinverduijn/gradle,lsmaira/gradle,robinverduijn/gradle,gstevey/gradle,gradle/gradle,gstevey/gradle,gstevey/gradle,blindpirate/gradle,gstevey/gradle,blindpirate/gradle,gradle/gradle,gradle/gradle,blindpirate/gradle,gstevey/gradle,blindpirate/gradle,robinverduijn/gradle,robinverduijn/gradle,blindpirate/gradle,blindpirate/gradle,gstevey/gradle,robinverduijn/gradle,lsmaira/gradle,robinverduijn/gradle,lsmaira/gradle,robinverduijn/gradle,gstevey/gradle,gradle/gradle,gstevey/gradle,lsmaira/gradle,blindpirate/gradle,robinverduijn/gradle,gradle/gradle,blindpirate/gradle,robinverduijn/gradle,lsmaira/gradle,gstevey/gradle,lsmaira/gradle,lsmaira/gradle,gradle/gradle,robinverduijn/gradle,gradle/gradle,blindpirate/gradle,gradle/gradle,lsmaira/gradle,blindpirate/gradle,lsmaira/gradle,lsmaira/gradle,gradle/gradle,robinverduijn/gradle