XML-RPC: Fix bracing of conditionals around doc blocks.

props redsweater, DrewAPicture.
fixes #27506.

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Update TinyMCE to the current development version, 4.0.21.1. Fixes #27744
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git-svn-id: http://core.svn.wordpress.org/trunk@27898 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Bump MediaElement.js to `2.14.2`. Release Notes: https://github.com/johndyer/mediaelement/commit/743f4465231dc20e6f9e96a5cb8b9d5299ceddd3.

Fixes #27582.


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git-svn-id: http://core.svn.wordpress.org/trunk@27899 1a063a9b-81f0-0310-95a4-ce76da25c4cd