Added GraphView class.
Added GraphViewController class and corresponding xib file.
Making sure that autoresizing mask of GraphViewController's view is not translated into constraints.
Added a GraphView which takes up the entire view of GraphViewController.
Added CombinatoricsHelper class and implemented public class method randomFloat.
Forgot to connect the testView IBOutlet.
GraphViewController now handles resizing of its GraphView. Lots of room for improvements, though.
Implemented mouseDragged: method in VertexView class. VertexViews can now be moved around using the mouse.