crowdcover/openstreetmap-website — pull request #7 by bryanjswift (2014-06-25 17:57:28+00:00)
Title: Change `Story.overlays` to `keyid => function`

Fixes crowdcover/crowdcover#355

The `function`s in `Story.overlays`, when invoked, return new instances
of `L.Site` based on the tileset key. Re-using the `L.Site` instances
was causing layers to not display in map previews.