Add javascript Location Pin model

LocationPin#index returns JSON to AJAX request.
LocationPin#coords returns an array instead of a js object; js Map functions expect a location pin to hold coordinates in an array.
Add js LocationPin model
Add initialize-app script to refactor javascript to MVC pattern
Merge pull request #118 from spring-peepers-2014/chore/refactor-location-pin-to-js-mvc

Chore/refactor location pin to js mvc