[openstreetmap-website] Disable automatic gravatar opt-in, as it violates the privacy policy (#519)

Štefan Baebler notifications at github.com
Wed Nov 6 09:13:54 UTC 2013

I've reported a [new bug in libravatar](https://bugs.launchpad.net/libravatar/+bug/1248456) asking for salting. Please add your opinions and ideas about salting there (or here, and i'll report them there).

On an related note, even with salted hashes user's identities across sites can be exposed using visual image comparison (reverse google image search), but that can only happen if user has provided an unique image.

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