Twenty Fourteen: change the background color of author's avatars in comments to black. Props iamtakashi, fixes #25309.

git-svn-id: https://develop.svn.wordpress.org/trunk@25500 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fourteen: add underline style back to links in body text. Props iamtakashi, fixes #25307.

git-svn-id: https://develop.svn.wordpress.org/trunk@25501 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fourteen: remove `optimizeLegibility`. Props iamtakashi, fixes #25306.

git-svn-id: https://develop.svn.wordpress.org/trunk@25502 602fd350-edb4-49c9-b593-d223f7449a82