Restore Travis-CI configuration for OS X builds

3 jobs for travis-only-osx in 1 minute and 44 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #1164
docker linux amd64
amd64_build

00:00:24

 
  Test
passed #1165
docker linux amd64
amd64_test

00:00:23

passed #1166
docker linux amd64
deckard

00:00:55