Remove go tip build on travis
Remove go tip build on travis

- tip build too slow :(
- build Go devel to CircleCI use osxcc

Signed-off-by: Koichi Shiraishi <2e5bdfebde234ed3509bcfc18121c70b6631e207@gmail.com>

zchee/docker-machine-driver-xhyve,zchee/docker-machine-driver-xhyve