aurajs/aura — pull request #259 by xcambar (2013-06-05 20:37:21+00:00)
Title: Defines the RequireJS config for Underscore and Backbone conditionnally

If your app already provides Underscore or Backbone, you may which to use the available versions, just as it is done with jQuery.

This is a necessary step if an Aura app wants to be integrated (with the smallest footprint possible) in an existing Backbone app.