TinyMCE: revert https://github.com/tinymce/tinymce/commit/158b7424103a02f579bd2bd0cd18f91d1b5e2183 and https://github.com/tinymce/tinymce/commit/576fa77aa20c7e029adb4bce5cab4bf3654cd58a as they may cause selection restore problems in old IE. See #28391.

git-svn-id: https://develop.svn.wordpress.org/trunk@28795 602fd350-edb4-49c9-b593-d223f7449a82
Update `phpunit` `grunt` task to not use deprecated `util` package. Run `npm install` or `sudo npm install` to get the updates.

Props jorbin.
Fixes #27343.


git-svn-id: https://develop.svn.wordpress.org/trunk@28796 602fd350-edb4-49c9-b593-d223f7449a82
Allow `wp_die()` to die in plain text when running the test suite.

Props jorbin.
Fixes #27749.


git-svn-id: https://develop.svn.wordpress.org/trunk@28797 602fd350-edb4-49c9-b593-d223f7449a82
Add a `grunt jshint:plugins` task.

Props MattyRob.
Fixes #28464.


git-svn-id: https://develop.svn.wordpress.org/trunk@28798 602fd350-edb4-49c9-b593-d223f7449a82
Improve Travis CI configuration for better performance.

Props netweb, jorbin.
Fixes #28301.


git-svn-id: https://develop.svn.wordpress.org/trunk@28799 602fd350-edb4-49c9-b593-d223f7449a82