Make travis log less verbose when zipping demos [skip ci]
Make travis log less verbose when zipping demos [skip ci]


Former-commit-id: 40e20d2ba761a24bd905a9aa01587d852d8e2449 [formerly 266ba8b1eca860ad03479ac7cd4ce8cec6e9e91c]
Former-commit-id: ea886490f20d514fe59f28dd6e35eab042c88ff1
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine