Fix map

[gjedeer]

The map is using Tangram library: https://mapzen.com/documentation/tangram/

Tangram is still maintained after Mapzen's death and uses Nextzen backend for maps now: https://github.com/tangrams/tangram-es/tree/master/platforms/android

If you're using the maps page, consider sending a pull request. I never used this feature so I'm not going to work on this myself.