examples:

Added some hazard curve geojson examples to match the ones already
existing in XML format.
hazard/parsers:

Implemented HazardCurveGeoJSONParser.
tests/hazard/parsers_test:

Changed a class reference to remove a deprecation warning.
tests/hazard/parsers_test:

Add tests for HazardCurveGeoJSONParser.
hazard/writers:

Added pretty printing for hazard curve and map json output.
risk/writers:

Added pretty print to LossMapGeoJSONWriter.