Removes nearby map marker logic

- Nearby map markers are not used, so this commit removes the
JavaScript logic associated with the nearby markers, as well as the
CSS, haml, and specs.
- Refactors the detail map JavaScript to show address when map marker
is clicked.

![screen shot 2014-04-15 at 12 00 44 am](https://cloud.githubusercontent.com/assets/704760/2704376/d624338a-c46b-11e3-9998-9e4e67b3a0ac.png)