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
Add @ticket references.

see #16854, #19198.

git-svn-id: https://develop.svn.wordpress.org/trunk@28800 602fd350-edb4-49c9-b593-d223f7449a82
Fix MediaElement i18n.

props Namibia, eherman24.
fixes #28366 for trunk.

git-svn-id: https://develop.svn.wordpress.org/trunk@28801 602fd350-edb4-49c9-b593-d223f7449a82
Revert [28776] and use a correct variable instead.

props miqrogroove.
fixes #28575.

git-svn-id: https://develop.svn.wordpress.org/trunk@28802 602fd350-edb4-49c9-b593-d223f7449a82
Merge branch 'master' of git://develop.git.wordpress.org