PROTON-935: drop Java 6 support and more to Java 7 by updating compiler source and target to 1.7
PROTON-935: drop Java 6 support and more to Java 7 by updating compiler source and target to 1.7

RobertoMalatesta/qpid-proton,Azure/qpid-proton,Azure/qpid-proton,clemensv/qpid-proton,apache/qpid-proton,ChugR/qpid-proton,ChugR/qpid-proton,Karm/qpid-proton,RobertoMalatesta/qpid-proton,wprice/qpid-proton,Karm/qpid-proton,bozzzzo/qpid-proton,Azure/qpid-proton,ssorj/qpid-proton,Karm/qpid-proton,Karm/qpid-proton,Karm/qpid-proton,ChugR/qpid-proton,bozzzzo/qpid-proton,gemmellr/qpid-proton,gemmellr/qpid-proton,alanconway/qpid-proton,astitcher/qpid-proton,bozzzzo/qpid-proton,apache/qpid-proton,prestona/qpid-proton,Karm/qpid-proton,wprice/qpid-proton,prestona/qpid-proton,prestona/qpid-proton,ssorj/qpid-proton,prestona/qpid-proton,clemensv/qpid-proton,wprice/qpid-proton,RobertoMalatesta/qpid-proton,ChugR/qpid-proton,kgiusti/qpid-proton,astitcher/qpid-proton,prestona/qpid-proton,apache/qpid-proton,ChugR/qpid-proton,RobertoMalatesta/qpid-proton,apache/qpid-proton,apache/qpid-proton,clemensv/qpid-proton,Karm/qpid-proton,Azure/qpid-proton,bozzzzo/qpid-proton,RobertoMalatesta/qpid-proton,gemmellr/qpid-proton,ssorj/qpid-proton,kgiusti/qpid-proton,wprice/qpid-proton,kgiusti/qpid-proton,Karm/qpid-proton,wprice/qpid-proton,RobertoMalatesta/qpid-proton,bozzzzo/qpid-proton,bozzzzo/qpid-proton,astitcher/qpid-proton,wprice/qpid-proton,RobertoMalatesta/qpid-proton,alanconway/qpid-proton,RobertoMalatesta/qpid-proton,gemmellr/qpid-proton,Azure/qpid-proton,prestona/qpid-proton,prestona/qpid-proton,RobertoMalatesta/qpid-proton,clemensv/qpid-proton,astitcher/qpid-proton,ChugR/qpid-proton,ssorj/qpid-proton,wprice/qpid-proton,bozzzzo/qpid-proton,gemmellr/qpid-proton-j,wprice/qpid-proton,prestona/qpid-proton,bozzzzo/qpid-proton,clemensv/qpid-proton,clemensv/qpid-proton,RobertoMalatesta/qpid-proton,alanconway/qpid-proton,Azure/qpid-proton,bozzzzo/qpid-proton,prestona/qpid-proton,Karm/qpid-proton,wprice/qpid-proton,gemmellr/qpid-proton,Azure/qpid-proton,astitcher/qpid-proton,Karm/qpid-proton,alanconway/qpid-proton,Azure/qpid-proton,clemensv/qpid-proton,gemmellr/qpid-proton-j,prestona/qpid-proton,Karm/qpid-proton,Karm/qpid-proton,kgiusti/qpid-proton,apache/qpid-proton,alanconway/qpid-proton,RobertoMalatesta/qpid-proton,wprice/qpid-proton,kgiusti/qpid-proton,bozzzzo/qpid-proton,kgiusti/qpid-proton,clemensv/qpid-proton,clemensv/qpid-proton,clemensv/qpid-proton,gemmellr/qpid-proton,ssorj/qpid-proton,bozzzzo/qpid-proton,prestona/qpid-proton,Azure/qpid-proton,prestona/qpid-proton,clemensv/qpid-proton,ssorj/qpid-proton,Azure/qpid-proton,wprice/qpid-proton,alanconway/qpid-proton,Azure/qpid-proton,astitcher/qpid-proton