Issue #1304464: Rollback extlink target custom window name option.
Issue #2243457 by herve001 | rian76: CSS exclusion stopped working.
Issue #2255295: Improve compatibility with screen readers.
Issue #2254471: Ensure extlink settings exist during AJAX requests.
Rephrasing description on image links.
Merge tag '7.x-1.17' of git://drupalcode.org/project/extlink