Move test for Pager Earthquake Fatality Model from safe.engine to safe.impact_functions.
Add init file in safe.impact_functions.earthquake.test package.
Move Volcano Polygon on Population IF from safe.engine to safe.impact_functions.
Address FIXME Ole: Add test for Volcano Point on Population.
Add test for EarthquakeBuildingImpactFunction.
Add test for Categorised Hazard Population Impact Function.
Merge branch 'safe_refactor' of github.com:akbargumbira/inasafe into safe_refactor