travis: properly define the env matrixes for building the code
travis: properly define the env matrixes for building the code

fsouza/go-dockerclient,paulbellamy/go-dockerclient,csrwng/go-dockerclient,tarsisazevedo/go-dockerclient,davidstack/go-dockerclient,tarsisazevedo/go-dockerclient,davidstack/go-dockerclient,ybogdanov/go-dockerclient,bboreham/go-dockerclient,csrwng/go-dockerclient,achanda/go-dockerclient,ybogdanov/go-dockerclient