Dots are drawn in different colors based on what direction they're facing

For #44. I actually grabbed the colors from image of our uniforms, so it's grayish navy for north/south, gold for west, white for east.

Also, draw the selected dot in purple!

![screen shot 2014-08-13 at 11 59 32 pm](https://cloud.githubusercontent.com/assets/1168853/3916781/8feba758-2380-11e4-8adf-ef82b0d86bf2.png)