ScottLogic/insight — pull request #189 by niksoper (2014-09-15 09:39:20+00:00)
Title: ChartGroup filterChanged

- The addition of the filterChanged method allows clients to act when a ChartGroup's filtering has changed.
e.g. Showing or hiding a button to clear all filters.
- Reducing the opacity of filtered out points on a scatter or bubble series allows the filtered points to stand out more.