Code generation for controllers without custom classes & other enhancements

[Frizlab]

• On OSX, instead of the only method instantiateControllerWithIdentifier() which returns AnyObject, two methods are generated: instantiateViewControllerWithIdentifier() and instantiateWindowControllerWithIdentifier() returning respectively NSViewController and NSWindowController.
• Methods are generated for controllers which do not have a custom class.
• Segue return a destination even for destinations who don't have a custom class.
• Other small modifications (project upgrade with Xcode 7, indentation fixes, etc.)

Note: I did not test my modifications very much. Only tested on a small project on OSX.

[krzyzanowskim]

@Frizlab did you address this ticket: https://github.com/krzyzanowskim/Natalie/issues/36 ?

[Frizlab]

Partly, yes. (Partly because segue for controllers which do not have a custom classes are still not accessible directly.)

[krzyzanowskim]

thanks!