User can create location

https://trello.com/c/QXF8a4rI/41-as-a-user-i-can-create-a-location-for-the-trip

![screen shot 2014-11-18 at 5 33 47 pm](https://cloud.githubusercontent.com/assets/3759510/5097503/42f3d942-6f49-11e4-89ce-ab9cdbe42d86.png)

LocationController will likely not have any trip reference, at least not yet.