Results 2 issues of Brian Mc Donald

Thank you for the wonderful and useful library. When using ```plot_percentage=False``` option, some labels are to 4 decimal points, which takes up too much space. Is there a way to...

**Is your feature request related to a problem? Please describe.** Currently geotiff.io is limited to calculations for single polygons. Adding a feature to do analysis on multiple polygons (multi-polygon geojson)...