Added ability to toggle report visibility
Added ability to toggle aggregate stats
Cleaned up overlay loading code
Allow toggling of overlay layers
Add default layers to the map
Updated zoom code to include subdistrict level
Order layers correctly
Fixed bug where aggregates would overlay reports
Fixed bug where aggregates would overlay reports
Handle the case where there are no reports
Merge pull request #13 from smart-facility/layer-controls

Layer controls: refactor data loading, report and aggregate overlays in layer control.