Run all demos in travis
Run all demos in travis


Former-commit-id: 956bcac1dcdda29fec6d887e8f95062c8913fa74 [formerly 1684672615a80041c63cfc323e6709f9ed8d58d4]
Former-commit-id: da93af24db267e98c5156b51e7ea3959c846e292
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine