Added a second delegate function, ditDoubleTapAt in WhirlyGlobeViewControllerDelegate protocol, so that single tap delegate is not called on double tap.
Merge branch 'develop' of https://github.com/SudoPlz/WhirlyGlobe into develop

Merging in order to push again.
Merge branch 'doubleTapZoomIn' of https://github.com/SudoPlz/WhirlyGlobe into doubleTapZoomIn

Merging doubleTapZoomIn.