TinyMCE: update to 4.0.18, see #24067
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Allow the role attribute in kses for all elements.

props mikecorkum.
fixes #24098.

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Add jquery.masonry.min.js. fixes #25351.

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Don't default to current user for capability checks when dealing with a post without an author (post_author = 0).

Undoes [12053]. While it risks breakage, this is a far safer and saner default for these situations.

props danielbachhuber.
fixes #27020.

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DFW: revert adding the 'image' button, images are edited in the media modal. See #24067.
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