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

[Eugene Alvin Villar]

Using the demo site, my browser's history is polluted:

![hash-browser-polluted](https://f.cloud.github.com/assets/873653/875271/ea28820e-f89d-11e2-9079-66e4f945b273.png)

I'm running Firefox 22.0 under Kubuntu Quantal.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/378#issuecomment-21756758
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