Update .travis.yml
Update .travis.yml

Changed travis config to use the new container-based system. Fixes #135
kigsmtua/hipster,nkhuyu/hipster,caidongyun/hipster,Navaneethsen/hipster,artfullyContrived/hipster,Navaneethsen/hipster,kigsmtua/hipster,nkhuyu/hipster,caidongyun/hipster,kigsmtua/hipster,artfullyContrived/hipster,gabizekany/hipster,citiususc/hipster,pablormier/hipster,pablormier/hipster,citiususc/hipster,gabizekany/hipster,nkhuyu/hipster,artfullyContrived/hipster,Navaneethsen/hipster,caidongyun/hipster,gabizekany/hipster,citiususc/hipster,pablormier/hipster