basemap-stamen: minor improvements
basemap-stamen: minor improvements

* correct attribution
* add some layers //commented
* refactor (for the sake of perfection)

Hubertzhang/ingress-intel-total-conversion,3ch01c/ingress-intel-total-conversion,Hubertzhang/ingress-intel-total-conversion,3ch01c/ingress-intel-total-conversion,McBen/ingress-intel-total-conversion,Hubertzhang/ingress-intel-total-conversion,3ch01c/ingress-intel-total-conversion,McBen/ingress-intel-total-conversion,McBen/ingress-intel-total-conversion,sndirsch/ingress-intel-total-conversion,3ch01c/ingress-intel-total-conversion,sndirsch/ingress-intel-total-conversion,Hubertzhang/ingress-intel-total-conversion,sndirsch/ingress-intel-total-conversion,Hubertzhang/ingress-intel-total-conversion,McBen/ingress-intel-total-conversion,Hubertzhang/ingress-intel-total-conversion,Hubertzhang/ingress-intel-total-conversion,McBen/ingress-intel-total-conversion,3ch01c/ingress-intel-total-conversion,sndirsch/ingress-intel-total-conversion,3ch01c/ingress-intel-total-conversion,Hubertzhang/ingress-intel-total-conversion,sndirsch/ingress-intel-total-conversion