Add KML based vector layer.

Used OL example as a starting source.
Use kml file and assoc image generated by Sam.

This does not work to render the vector layer based on KML yet.
Try the TPDtest7.kml file
Remove .swo file
Use us-counties as an example in lieu of an actual grid.

This is to test coloring using style rules to if that works as a first pass.
Test using a basic style map to color vector layer
Add style rules to fillColor in feature based on attributes.
Use the larger US Counties file - more detail
Add .gitignore
Add a function to find the min and max of the CENSUSAREA of each feature
Create rules dynamically based on ranges
Adjusted ranges for better granularity at the smaller levels