Have icons in KML (and other API) view match internal colors

[jaycrossler]

Icons that are user-tailored are currently being re-colored using JavaSccript in the user's browser. This doesn't work for icons being shown in Google earth or other exports.

Potentially, we can have a PIL library that replicates the icon colorization, using something like:

/static/icon/house.png?from:red,to:purple,from:white,to:black,name=orange_house.png

This could then auto-generate the icon (and cache/save it for speed)