Notification Center support added

Hi!

I added support for the Notification Center. Added the menu item for it as well. Seems to work nicely, however I haven't fully tested click method, it should work though. 

Also, I did a re-indentation on the delegate file, hence the many changes it seems to have

@todo: Need to add support in applicationDidFinishLaunching: which I didn't have time for to add.