Twenty Eleven: only show secondary skip link on pages with secondary content, and remove duplicate title attribute in site title output. Props bcworkz, fixes #26950.

git-svn-id: https://develop.svn.wordpress.org/trunk@27569 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Eleven: make sure top post meta output isn't broken on small screens. Fixes #27061.

git-svn-id: https://develop.svn.wordpress.org/trunk@27570 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Twelve: remove unused `singular` selectors in print CSS block. Props jbkkd, fixes #26866.

git-svn-id: https://develop.svn.wordpress.org/trunk@27571 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Twelve: style `select` element. Props ramonchiara, fixes #27434.

git-svn-id: https://develop.svn.wordpress.org/trunk@27572 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fourteen: merge two similar strings in Customizer featured content help text. Props celloexpressions, fixes #26647.

git-svn-id: https://develop.svn.wordpress.org/trunk@27573 602fd350-edb4-49c9-b593-d223f7449a82
Customizer: Use `esc_url_raw` to escape customizer URL settings to prevent double encoding.

props westonruter, ocean90.
fixes #26569.

git-svn-id: https://develop.svn.wordpress.org/trunk@27574 602fd350-edb4-49c9-b593-d223f7449a82