Refactors home js, implements basic spatial search

Starts on #5 

Refactors home page javascript to follow a more "leaflet" like pattern for developing js within GeoBlacklight.

Adds in spatial search based off of navigating the home map and clicking the search map button.

![screen shot 2014-09-16 at 1 30 23 pm](https://cloud.githubusercontent.com/assets/1656824/4294516/6478b762-3de0-11e4-9520-8585dc63c77f.png)

![screen shot 2014-09-16 at 1 30 52 pm](https://cloud.githubusercontent.com/assets/1656824/4294519/680e31d6-3de0-11e4-94c0-1a59d2cf5df6.png)