added jdk8 to travis build matrix
added jdk8 to travis build matrix

glamarre360/stagemonitor,hexdecteam/stagemonitor,trampi/stagemonitor,glamarre360/stagemonitor,stagemonitor/stagemonitor,trampi/stagemonitor,hexdecteam/stagemonitor,elevennl/stagemonitor,elevennl/stagemonitor,sdgdsffdsfff/stagemonitor,hexdecteam/stagemonitor,hexdecteam/stagemonitor,trampi/stagemonitor,glamarre360/stagemonitor,glamarre360/stagemonitor,stagemonitor/stagemonitor,elevennl/stagemonitor,marcust/stagemonitor,elevennl/stagemonitor,sdgdsffdsfff/stagemonitor,sdgdsffdsfff/stagemonitor,stagemonitor/stagemonitor,trampi/stagemonitor,marcust/stagemonitor,stagemonitor/stagemonitor,marcust/stagemonitor,marcust/stagemonitor,sdgdsffdsfff/stagemonitor