3.8 is ready for widespread, release candidate level of testing.

Built from https://develop.svn.wordpress.org/trunk@26604


git-svn-id: http://core.svn.wordpress.org/trunk@26494 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add Open Sans as a dependency to install.css and add Dashicons as a dependency to some other CSS files. see #26255.

Built from https://develop.svn.wordpress.org/trunk@26605


git-svn-id: http://core.svn.wordpress.org/trunk@26495 1a063a9b-81f0-0310-95a4-ce76da25c4cd