rackt/react-router — pull request #480 by gaearon (2014-11-18 01:35:31+00:00)
Title: [fixed] Pending transition is aborted if user navigates away

Previously, navigating (by clicking Back button or a link) while a transition in progress would put router into an inconsistent state.

Now, a pending transition will be aborted by the router if user navigates away while it was pending.

Fixes #479