[openstreetmap-website] Use a hash anchor for location/zoom persistence (#378)

[Andrés Maneiro]

@jfirebaugh do you know geohash? It allows for shortening locations taking into account zoom level. There is plenty of libraries out there (ruby, js, etc) to interact with it. Check https://en.wikipedia.org/wiki/Geohash and http://geohash.org in case it may be useful. 

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