Migration to MVC

Intermediary PR for #204 

* [x] Backbone views and models
* [x] Move pieces of UI code into views
* [x] Plug maps initialization to views
* [x] Load GeoJSON as collection
* [x] Load layer from Backbone collection
* [ ] Filtered collection https://github.com/jmorrell/backbone-filtered-collection
* [ ] Refresh results list from collection
* [ ] Get rid of data- attributes in DOM
* [ ] Plug backpack to collection
* [ ] Plug home favorite/random to collection