[openstreetmap-website] Implement `geo:` URLs for sharing (#799)

[Hans-Christoph Steiner]

I just installed as many Android map apps as I could find, and it looks like they all respond to `geo:`:
![view-geo-in-android](https://cloud.githubusercontent.com/assets/143465/5708552/69bc5634-9a92-11e4-9fb9-4dc825464c91.png)


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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/799#issuecomment-69620538
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