Project file changes

Changes for commits 1a24b07f - 46a2ad58
Add a main storyboard the app
Update the News module to return a UINavigationController instead of the StoryListViewController
Fixes a bug where new stories would not be displayed immediately after being updated
Merge pull request #116 from MIT-Mobile/3.6/ipad-news-categories-if-no-internet
made reloaddata thread safe
using a NSMapTable instead of an Array
added load more table view cell height constant
removed fetch results controller for categories
box notation instead of numberWithFloat
When coming back from story detail and a more stories request is happening we still want to reload the view with that information after the request has been finished.
added logic to stop any other reload request from starting while next story is loading more stories.
if there is an error send back error.
When coming back from story detail and loading more stories for next story, make sure cell says "Loading More..."

If loading more stories do not let user switch grid/list views.
refresh control should spin if refreshing categories view during first load
Initial commit of the category data source
Changes for the category data source
Tweaks to the fetched results controller setup process
Clean up the self references and unlock the lock
Merge pull request #125 from MIT-Mobile/3.6/news-cached-categories

3.6/news cached categories