[openstreetmap-website] Gravatar support (#131)

[Tom Hughes]

As an example of what I mean about the sizes we store, for me we have the original I uploaded:

![Original](http://www.openstreetmap.org/attachments/users/images/000/003/980/original/ce985001be4d0a2ab6e3fbb28b4052b7.jpeg)

The resized "large" image:

![Large](http://www.openstreetmap.org/attachments/users/images/000/003/980/large/ce985001be4d0a2ab6e3fbb28b4052b7.jpeg)

The resized "small" image:

![Small](http://www.openstreetmap.org/attachments/users/images/000/003/980/small/ce985001be4d0a2ab6e3fbb28b4052b7.jpeg)

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/131#issuecomment-9376270
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