Added support for <LineStyle> tags.

Hi! Thanks a million for importing the google code. It certainly saved me a lot of time and I could get right down to programming. In order to make cool graphs with line segments of different colors (see below), I had to extend the lib a tiny bit.

![screen shot 2013-06-11 at 12 22 36 am](https://f.cloud.github.com/assets/1118185/634532/45a27f48-d21c-11e2-9a4e-5e01a65b0983.png)

P.S. I might have a solution to the point in polygon problem if you haven't completely finished. I am using KML files to define geofences for UAV boundaries, and so needed to determine if a point were inside a concave polytope. Moreover, I have to check that the polytope is indeed closed, i.e. watertight.