engine/views:

Implemented a sketch of the `calc_hazard_info` view.
engine/views:

Implemented `calc_risk_info` view.
engine/tests:

Added a test case for exercising the `_calc_to_response_data` util
function.
engine/calc_urls:

Moved calc_urls to v1 package.
engine/v1:

Added missing __init__ module.
urls:

Added API versio (v1) to URL mapping.
engine/views:

Include API version in constructed response urls.
engine/tests:

Updated test assertions to include the `v1` component of each url.