Twenty Fourteen: sanitize the values of Featured Content layout option, props kwight. Fixes #26408.

git-svn-id: https://develop.svn.wordpress.org/trunk@26636 602fd350-edb4-49c9-b593-d223f7449a82
Remove unneeded transition styles on adminmenu links that make the transition between expanded and collapsed menubars choppy in Safari and Chrome. Fixes #26406.

git-svn-id: https://develop.svn.wordpress.org/trunk@26637 602fd350-edb4-49c9-b593-d223f7449a82
Allow HTML in the theme name for the themes.php template.

props matveb.
fixes #26411.


git-svn-id: https://develop.svn.wordpress.org/trunk@26638 602fd350-edb4-49c9-b593-d223f7449a82