Leaflet/Leaflet — pull request #2655 by yohanboniface (2014-04-28 12:37:25+00:00)
Title: Fix marker.bringToFront not being call on featuregroup.bringToFront

Not sure though about your plans here.
Also, marker doesn't have any `_bringToBack` method, so it isn't symmetric.

But without this change, calling `bringToFront` on a `FeatureLayer` doesn't do nothing on markers, which is disconcerting.

@mourner thoughts?