[#4] Update the Google Maps SDK to Version 1.3.1. Found a way to bypass the GMSBlockingGestureRecognizer and use the own UIGestureRecognizer instead. Changed header to better fit the Google Maps SDK style. Documented everything.
Merge branch 'master' of https://github.com/rweindl/google-maps-sdk-ios-drag-drop

Conflicts:
	README.md