Switch to Open Street Maps for IEEE lab's location.

OSM provides a better rendering of the IEEE lab's location as well as the
ability to add our own markers (the IEEE Collaboration Lab should show up a
little while after this commit hits master).

[Here's a screenshot](http://i.imgur.com/hBxwgOg.png), and [here's an old shot for comparison](http://i.imgur.com/WRMtzjp.png).