Add support for a heatmap layer
Workaround heatmap bug so layer is not shown on load
Align layer list left
Improve coverage layer title
Merge pull request #128 from taarifa/heatmap

Heatmap layer
Remove the filters in the national dashboard

- With the regional dashboard the region/lga/ward filters are no
longer needed and just cause confusion
- Just kept the group_by filter which is now added to the
status summary plot directly