marionettejs/backbone.marionette — pull request #1774 by jaridmargolin (2014-08-28 00:53:29+00:00)
Title: Allow use of `el` in RegionManager.addRegion definition.

RegionManager does not currently support region definitions that use `el`. As LayoutView uses RegionManager behind the scenes, it also will not be able to use `el` when defining region definitions.