made edit and update actions, tests working
removed thin from Gemfile
Implemented edit and delete functionality for stories
create new story has form same page, clicking on 'create a new story' makes the form appear
added missing ajaxy.js file for previous commit
used ajax to make the creation of a new story instance able to be done in the root path.
added comments to the ajax
changed _form partial class to be togglable, added line break after image in _story partial
Merge pull request #8 from shmeadyy/comments-for-ajax-ken

add update, destroy methods, ajax for index page