Runtime implementation to allow UIPopoverController on iPhone apps.
By default, Popovers are available for iPad apps only. This is a category on UIPopoverController class, that overrides the standard implementation of _popoversDisabled to make Popovers available for use on iPhone apps.
This is for demonstration purpose. The best approach for this probably is change the implementation of _popoversDisabled using Method Swizzling.
Also, this probably won’t be accepted by "Apple's Private API Validator" when submitting binary to AppStore. For Enterprise distributions it must be fine.
For more information, read Mark Sands’ article about “How Apple Cheats” on http://marksands.github.io/2014/05/27/how-apple-cheats.html
