Add support for build custom hazardlib branches is travis
Add support for build custom hazardlib branches is travis


Former-commit-id: 7df00a0b051cf2db699971fb116aa8a44a2904c6 [formerly 7df00a0b051cf2db699971fb116aa8a44a2904c6 [formerly 38217801fd043ad2a0eb6eb627fef1fcad4c8340]]
Former-commit-id: c6bf5ef6ae489a66603a440f5201d2c15dc8d960
Former-commit-id: 764def27634e4f16f984ca515d7edb66348d7c57
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine