Use newer container-based builders in Travis and test JDK8 too
Use newer container-based builders in Travis and test JDK8 too

Fixes #468

rocwzp/zipkin,wuqiangxjtu/zipkin,hydro2k/zipkin,xujianhai/zipkin,betable/zipkin,wuqiangxjtu/zipkin,drax68/zipkin,dsyer/zipkin,hydro2k/zipkin,gneokleo/zipkin,thelastpickle/zipkin,lqjack/zipkin,drax68/zipkin,hydro2k/zipkin,jamescway/zipkin,xujianhai/zipkin,rocwzp/zipkin,jfeltesse-mdsol/zipkin,fengshao0907/zipkin,dsyer/zipkin,dsyer/zipkin,jamescway/zipkin,yshaojie/zipkin,hydro2k/zipkin,thelastpickle/zipkin,jfeltesse-mdsol/zipkin,lqjack/zipkin,dsyer/zipkin,zhoffice/zipkin,rjbhewei/zipkin,c3p0hz/zipkin,thelastpickle/zipkin,drax68/zipkin,jfeltesse-mdsol/zipkin,fengshao0907/zipkin,mzagar/zipkin,thelastpickle/zipkin,chang2394/zipkin,zhoffice/zipkin,rocwzp/zipkin,yshaojie/zipkin,jfeltesse-mdsol/zipkin,rjbhewei/zipkin,Flipkart/zipkin,chang2394/zipkin,yshaojie/zipkin,zhoffice/zipkin,Flipkart/zipkin,Yelp/zipkin,gneokleo/zipkin,mt0803/zipkin,lqjack/zipkin,xujianhai/zipkin,prat0318/zipkin,srijs/zipkin,lqjack/zipkin,zhoffice/zipkin,mzagar/zipkin,Yelp/zipkin,drax68/zipkin,mzagar/zipkin,jamescway/zipkin,wuqiangxjtu/zipkin,dsyer/zipkin,dsyer/zipkin,yshaojie/zipkin,coursera/zipkin,srijs/zipkin,srijs/zipkin,prat0318/zipkin,wuqiangxjtu/zipkin,coursera/zipkin,rocwzp/zipkin,Yelp/zipkin,betable/zipkin,rjbhewei/zipkin,prat0318/zipkin,c3p0hz/zipkin,chang2394/zipkin,jstanier/zipkin,drax68/zipkin,gneokleo/zipkin,mzagar/zipkin,coursera/zipkin,c3p0hz/zipkin,chang2394/zipkin,srijs/zipkin,Yelp/zipkin,jstanier/zipkin,Flipkart/zipkin,coursera/zipkin,jamescway/zipkin,c3p0hz/zipkin,prat0318/zipkin,jstanier/zipkin,mt0803/zipkin,gneokleo/zipkin,drax68/zipkin,rjbhewei/zipkin,xujianhai/zipkin,betable/zipkin,mt0803/zipkin,jstanier/zipkin,betable/zipkin,mt0803/zipkin,fengshao0907/zipkin,fengshao0907/zipkin,Flipkart/zipkin