Update MediaElement.js to 2.11.1

Also get rid of its non-minified JS/CSS files.

props wonderboymusic, ocean90. fixes #24015.

git-svn-id: http://core.svn.wordpress.org/trunk@23968 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Enforce video dimensions.

props wonderboymusic. see #23831.

git-svn-id: http://core.svn.wordpress.org/trunk@23969 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-beta1-23970.

git-svn-id: http://core.svn.wordpress.org/trunk@23970 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Thirteen: reinstate Audio post format max-width layout handling, lost in r23964. See #23955, props obenland.

git-svn-id: http://core.svn.wordpress.org/trunk@23971 1a063a9b-81f0-0310-95a4-ce76da25c4cd