use textContent instead of stripping HTML in undo
remove HTML stripping from undo plugin as it uses textcontent directly
Merge branch 'fix-undotextcontent' of git://github.com/imnotjames/LRTEditor into imnotjames-fix-undotextcontent

Conflicts:
	src/LRTEditor.UndoPlugin.js

Combine localized 'selection' with using textContent in undobuffer
Merge pull request #4 from imnotjames/fix-undotextcontent

use textContent instead of stripping HTML in undo