gitignore fixed to actually ignore secrets
Updated List controller to response to requests for json and html.  Index action responds with json containing a collection of all lists for current user
main.js created.  Document.ready function is used to bind event listeners.  Created an event listener on a link element with id 'get-lists' which sends a request to the grocery_lists controller index action via ajax.
Merge pull request #13 from ClarkGH/list_controller

List controller