TinyMCE: update to 4.1.6+. Adds support for cache-busting when auto-loading JS and CSS. Change the tests to run in /build. Changelog: https://github.com/tinymce/tinymce/blob/master/changelog.txt.
Fixes #30079

git-svn-id: https://develop.svn.wordpress.org/trunk@29994 602fd350-edb4-49c9-b593-d223f7449a82