ipython/ipython — pull request #6609 by SylvainCorlay (2014-10-03 19:13:02+00:00)
Title: Add semantic classes to top-level containers for single widgets

@jasongrout @jdfreder This is a rebased version of the commit from Jason in PR #6256, which is included
by PR #6341. Merging this independently of the larger reorganization of the widgets would make it easier for us.