[openstreetmap-website] Facebook share image (#739)

[Rezonansowy]

@tomhughes It still doesn't work. Facebook still displays generic OSM logo istead of the real map. It looks like this:
![fb1](https://cloud.githubusercontent.com/assets/6929363/5578710/e8b35c82-902c-11e4-91d6-466fdb78939d.png)

and should look like this:
![fb2](https://cloud.githubusercontent.com/assets/6929363/5578713/f28d21e8-902c-11e4-9be5-e07263ee7693.png)



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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/739#issuecomment-68354830
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