Feat/map markers

Adds map icons for each business yelp api returns*

*as long as that business has a coordinates property. Later I’ll convert the address to coordinates using google’s geoencoder, so that everything yelp returns gets placed on the map

Check out that sweet icon:
![screen shot 2014-09-05 at 3 33 02 pm](https://cloud.githubusercontent.com/assets/6556190/4172822/53c3a7e0-354f-11e4-82cb-8e732f6f88cc.png)