ipython/ipython — pull request #6675 by jasongrout (2014-10-10 17:27:47+00:00)
Title: Refactor widget child view lists

This PR attempts to factor out the maintaining of child view lists from the WidgetView class. Advantages include:

* Ability to easily have different types of containers for child views
* Less code in WidgetView
* Most importantly, the ability to easily have multiple kinds of child view lists (for example, suppose you have a two-column widget, and want a separate child list for the left and right).