New feature: street hint to improve the assignment of geo locations to road network

We are happy to announce a new feature. It improves the assignment of geo locations to the road network. If you want to know typical use cases and how to use this feature, I recommend you to read this short article: https://www.graphhopper.com/blog/2018/06/22/assign-geo-locations-to-roads-and-its-impacts-on-route-optimization/