Improved .travis.yml
Improved .travis.yml


Former-commit-id: 847ba5808c1eca180133d1f8b88b1636b2121655 [formerly 847ba5808c1eca180133d1f8b88b1636b2121655 [formerly 887223c0b383e31f52ced6901a030d8498df19c2]]
Former-commit-id: a3b21d7b957dfc54d57d308cb6323dd2acfbcac6
Former-commit-id: ab536f9e426a6ea29dcdb83dd6bd79f1e6b2787f
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine