set permgen explicitly for travis ci build
set permgen explicitly for travis ci build

- might consider to move travis ci build to use jdk8

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