Work in progress while adding content insets support
Added support for content insets and also changed the whole paradigm to KVO - no need for UIScrollView delegate methods in view controller anymore
Removed the old code and did some small adjustments
Removed KVO paradigm because we need to know when dragging actually stops (because content offset may also stay the same), so went now we go the road of intercepting the delegate; not all delegate methods have been overriden yet
Fixed issues that we had in delegate paradigm, so all is working good if manual inset setting is applied, because automatic vc insets mess up on navigation push/pop; this won't be the final solution though as it looks now that this can be accomplished through KVO, because there is no more need to know when the drag has been released
Moved back to KVO, fixed the issues and all looks fine now
Merged KVO changes into master