Leaflet/Leaflet.markercluster — pull request #421 by evanvosberg (2014-11-13 12:06:38+00:00)
Title: Provide more detailed context information on the spiderfied event

When listening to the `spiderfied` event it's pretty hard to get the spiderfied context. The only provided target is target which is a reference of whole cluster object.

But only one marker with ist child markers got spiderfied, so it's helpful to provide this information when fire the event.