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

[fuddl]

the current favicon looks blurry on retina screens:

![Chrome tabs on retina](https://cloud.githubusercontent.com/assets/842548/3951499/8606725e-26d7-11e4-87f5-7469f14f4c00.png)
You can merge this Pull Request by running:

  git pull https://github.com/fuddl/openstreetmap-website master

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/804

-- Commit Summary --

  * added retina favicon

-- File Changes --

    A app/assets/images/favicon.png (0)
    M app/views/layouts/_head.html.erb (4)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/804.patch
https://github.com/openstreetmap/openstreetmap-website/pull/804.diff

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