twosigma/beaker-notebook — pull request #575 by scottdraves (2014-09-06 17:34:47+00:00)
Title: allow removing plugins from notebook, plus other bug fixes

Fix Issue #77 by making clicking on an active plugin in the plugin manager remove that plugin if possible (ie it is unused).

Also fix Issue #568 , by just checking the item before adding it.

Also fix a longstanding unknown bug where the exit method was not called on plugins when the notebook was closed.