Don't allow images to be set as featured image until they have been processed.

props kadamwhite. fixes #23317.

git-svn-id: http://core.svn.wordpress.org/trunk@23956 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Thirteen: add missing "yellow" color tag.

git-svn-id: http://core.svn.wordpress.org/trunk@23957 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Update MediaElement.js to 2.11.0.

Props wonderboymusic
see #24015


git-svn-id: http://core.svn.wordpress.org/trunk@23958 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Thirteen: display gallery captions correctly in IE7 and IE8. Props celloexpressions and kovshenin, fixes #23996.

git-svn-id: http://core.svn.wordpress.org/trunk@23959 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-beta1-23960.

git-svn-id: http://core.svn.wordpress.org/trunk@23960 1a063a9b-81f0-0310-95a4-ce76da25c4cd