Travis-CI: Enable JDK8
Travis-CI: Enable JDK8

timezra/metrics,gburton1/metrics,ind9/metrics,bentatham/metrics,mnuessler/metrics,dropwizard/metrics,mattnelson/metrics,mveitas/metrics,mtakaki/metrics,mt0803/metrics,Banno/metrics,dropwizard/metrics,dropwizard/metrics,unitsofmeasurement/metrics,rexren/metrics,ohr/metrics,wfxiang08/metrics,mspiegel/metrics,slovdahl/metrics,slachiewicz/metrics,ChetnaChaudhari/metrics,chenxianghua2014/metrics,gburton1/metrics,AltitudeDigital/metrics,jasw/metrics,tempredirect/metrics,cirrus-dev/metrics,kevintvh/metrics,thelastpickle/metrics,mveitas/metrics,randomstatistic/metrics,jplock/metrics,egymgmbh/metrics,valery1707/dropwizard-metrics,signalfx/metrics