Added storyboard & AL, updated project file, slight restructure.

I've added a storyboard & AL for easy rotation, updated the project for
Xcode 5, and removed the chart reference from its datasource, instead
appending data from the view controller directly. Removed CanvasOverlay
category, replacing it with a method on the VC, and removed unused
TrackOverlay class.
Merge pull request #1 from sawithington/master

Added storyboard & AL, updated project file, slight restructure.