Merge branch '19130' of https://github.com/mikerodonnell89/backbone-x into 19131
issue #19224: Add support for model notifications
Merge pull request #33 from mikerodonnell89/19130

19130
Issue 19131: changes to document.js from Mike
Merge pull request #34 from lynnaloo/19131

19131
issue #19131: Swat.
Incident #19130 - cut out some code that prevented the system from adjusting readOnly attributes