Twenty Fifteen: update earlier patch to borders on linked images so we're not affecting the display of linked icons in widgets.

Props iamtakashi, fixes #29963.


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git-svn-id: http://core.svn.wordpress.org/trunk@30269 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: use antispambot to obfuscate email adresses in the social links menu.

Props tywayne, fixes #30214.


Built from https://develop.svn.wordpress.org/trunk@30270


git-svn-id: http://core.svn.wordpress.org/trunk@30270 1a063a9b-81f0-0310-95a4-ce76da25c4cd