TinyMCE: update to 4.0.18, see #24067
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git-svn-id: http://core.svn.wordpress.org/trunk@27235 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Allow the role attribute in kses for all elements.

props mikecorkum.
fixes #24098.

Built from https://develop.svn.wordpress.org/trunk@27388


git-svn-id: http://core.svn.wordpress.org/trunk@27236 1a063a9b-81f0-0310-95a4-ce76da25c4cd