Added functionality

Closing the main window via clicking the X will now prompt the user to
save.

Clicking Edit Scene now has the skeleton code that opens the Edit Scene
Window when clicked.  Currently, it just passes in a blank test scene,
but should have functionality changed to take in the selected scene
(when scenes become viewable).
Merge pull request #17 from TyroneLagore/master

Added functionality - Merged 03/29/14