CloudMade/Leaflet — pull request #430 by oesmith (2012-01-13 11:20:40+00:00)
Title: Layer control icons

This patch adds icons to `L.Control.Layers`. There's an optional extra parameter `iconUrl` on `addOverlay` and `addBaseLayer` that results in an `img` being inserted between the checkbox/radio input and the layer name in the list.

![example](http://olly.oesmith.co.uk/~oliver/github/leaflet-layer-icon.png)