downgraded dependency on jetty-util version 8 in order to fix jdk-6 compatibility
downgraded dependency on jetty-util version 8 in order to fix jdk-6 compatibility

cwardgar/gretty,cwardgar/gretty,akhikhl/gretty,aya-eiya/gretty,akhikhl/gretty,WilliamRen/gretty,saladinkzn/gretty,cwardgar/gretty,akhikhl/gretty