Map view work: GPS location, Observation points, and MLS locations

This is the appearance showing the GPS location in blue, the observation points in green, and the MLS locations in red (attached to their parent observation points with a line).
Also shown is the "locate me" button in the lower left.

![screenshot_2014-09-09-19-35-55](https://cloud.githubusercontent.com/assets/5495083/4210943/579fcf88-387e-11e4-8988-3cc26d9cbc0e.jpg)