Forward pingback IP during pingback verification.

Merges [27872] to the 3.8 branch.

props tellyworth, nacin.
fixes #27613.

Built from https://develop.svn.wordpress.org/branches/3.8@27873


git-svn-id: http://core.svn.wordpress.org/branches/3.8@27704 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix validation issue in get_the_password_form() caused by wpautop().

Merges [27134] to the 3.8 branch.

props andykeith.
fixes #27071.

Built from https://develop.svn.wordpress.org/branches/3.8@27874


git-svn-id: http://core.svn.wordpress.org/branches/3.8@27705 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use .screen-reader-text class instead of an alt attribute for overlay button labels on Themes screen.

Merges [27119] to the 3.8 branch.

props bramd.
fixes #26603.

Built from https://develop.svn.wordpress.org/branches/3.8@27875


git-svn-id: http://core.svn.wordpress.org/branches/3.8@27706 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Themes screen: Use a normal error for WP_Theme errors.

Merges [27760] to the 3.8 branch.

fixes #27235.

Built from https://develop.svn.wordpress.org/branches/3.8@27876


git-svn-id: http://core.svn.wordpress.org/branches/3.8@27707 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix two CSS issues in the 3.8 branch.

 * Comments dashboard widget: Use the proper class to avoid stretched "unapproved" red lines. [27564]
 * Fix the tags input in small viewports and make it a more reasonable size. (Was unusable in Firefox.) [27254]

fixes #26910, #27082.

Built from https://develop.svn.wordpress.org/branches/3.8@27877


git-svn-id: http://core.svn.wordpress.org/branches/3.8@27708 1a063a9b-81f0-0310-95a4-ce76da25c4cd