[openstreetmap-website] added retina favicon (#804)

[fuddl]

splendid!

![new retina favicon](https://cloud.githubusercontent.com/assets/842548/3964882/e2f8cb4e-278e-11e4-8bd4-aa18e4c09172.png)

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/804#issuecomment-52617606
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