export/hazard:
export/hazard:

Added support for exporting hazard maps as GeoJSON.


Former-commit-id: 02227328c159dc48d3c05d608155ddf7ef083c6f [formerly 02227328c159dc48d3c05d608155ddf7ef083c6f [formerly ccb280588cd7cc0e7807ac31ecb20d5ffa1497a0]]
Former-commit-id: 36d1568a553510b2ac17234a95ee44d20f7640d7
Former-commit-id: 312eb7a20c00e04c56908ddfa77283305f2e50a8
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine