TweetIt- Initial commit

Single View Application
TweetIt- Add TableVC to interact with storyboard

- Added TableVC onto Storyboard
- Added new class TIATableVC which will complement the physical element
on the storyboard
TweetIt- Connect storyboard TableVC to class

Identity Inspector updated so that the TableVC on our storyboard now
uses our custom class TIATableViewController. (Remember we’re using a
storyboard to launch our app, i.e. we haven’t coded anything in our
AppDelegate)