Fix strange travis behaviour [skip wheels][demos]
Fix strange travis behaviour [skip wheels][demos]


Former-commit-id: 734d185a1603bd1f6906aa892ce11edc9693efbd [formerly 4fafcfa7b562894f973aedff78408575c51af404]
Former-commit-id: 22002ff42250f8751ca3c6645076773eea5ed6b2
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine