openlayers/ol3 — pull request #121 by twpayne (2013-01-16 15:40:30+00:00)
Title: Attribution control refactoring

This pull request refactors the attribution control to use the frame state architecture. It has several nice features, including:

* Increased precision (the renderers record which data they use rather than having the attribution control trying to guess)
* Increased performance (attribution calculations are done in tile coord space rather than in geographical coordinates, re-projection is done just once)
* Integration with the render frame loop
* Works with all view types
* Handles rotation
* Fixes #50