Git commits in Moodle 3.3.0 by David Bogner

commit 726adbc22a02bd0032bd1bc02fbcf7fc8b015a79
Author: David Bogner <davidbogner@gmail.com>
Date:   Tue, 13 Dec 2016 22:04:13 +0800
Tag:    v3.3.0-beta

MDL-57374 editor: Pasting plain text in Atto removes all styles/classes