Add missing Dashicons classes to Network Admin menu, see #26630.
Built from https://develop.svn.wordpress.org/trunk@27444


git-svn-id: http://core.svn.wordpress.org/trunk@27291 1a063a9b-81f0-0310-95a4-ce76da25c4cd
At long last, a first pass at bringing the image editor into the media modal. props gcorne, DH-Shredder, tomauger. see #21811.

Built from https://develop.svn.wordpress.org/trunk@27445


git-svn-id: http://core.svn.wordpress.org/trunk@27292 1a063a9b-81f0-0310-95a4-ce76da25c4cd