Quick hackfest on Flood IF.
Faster flood OSM Building IF.
Merge develop upstream.
Address Charlotte's feedback.
Update exposure description.
Merge branch 'develop' of github.com:AIFDR/inasafe into flood_IF
Address Charlotte and Tim's feedbacks.
Merge pull request #1254 from akbargumbira/flood_IF

New Flood IF on OSM Building
Merge branch 'develop' of https://github.com/AIFDR/inasafe into generic_categorised_hazard