Add skeletal spec for java 9 support.
Add skeletal spec for java 9 support.

Just serves to collect issues for the time being, stories will be fleshed out later.

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