[openstreetmap-website] Port to Leaflet (#121)

[John Firebaugh]

As far as I know leaflet only has the one color. There's some nice ones in various colors in [map_sprite.png](https://github.com/jfirebaugh/openstreetmap-website/blob/master/app/assets/openlayers/theme/openstreetmap/img/map_sprite.png) but I haven't figured out how to use them in leaflet and I figured we can switch in a separate step anyway.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/121#issuecomment-10241024
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