[openstreetmap/openstreetmap-website] Added color preview box in tag browser sidebar (#1779)

[mmd]

Tried to test this coding locally, but somehow I'm getting escaped html. Not exactly sure where this comes from. Test on 701334bcc6f9cd31831fc8e62b1321ded4491c97 + merged stefanb/tag-colour-preview (1fc4fb9f6384d1ad9151910abe7bb3a0cd7d0057) into it.

![grafik](https://user-images.githubusercontent.com/5842757/37569081-9def1a3e-2add-11e8-8b9f-8a4d7d20839f.png)


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