added liljson requirement and requirements.txt (for pip)
added geometry compression. Also unicode to string coercion, python3 print_function and possibly better polygon debug information
Added a general color gradient generator
Let legend spill over, even though it blocks clicking on the map a bit
DataSets are now a list/array, and display on the legend in order
DataSets are lists, and display in order
clean up and added gis example