ArcBees/GWTP — pull request #592 by rdwallis (2014-10-03 17:36:47+00:00)
Title: Make PlaceManagerImpl use Historian instead of History

Uses `Historian` interface in `PlaceManagerImpl` instead of `History`.

It will be impossible to replace the GWT History implementation in 2.7. By switching to Historian GWTP users can replace the `DefaultHistorian` implementation with anther eg. to support PushState.

This does have a minor impact on behavior. Before when you called `revealCurrentPlace()` a History would refire it's state. Now it won't.