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

This reverts commit 73284c3b38efb163f51ef84457829938df9627e6.

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