Use hash_equals() for old md5 hashes.

Merges [30412] to the 3.7 branch.

Built from https://develop.svn.wordpress.org/branches/3.7@30416


git-svn-id: http://core.svn.wordpress.org/branches/3.7@30411 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Form validation for password resets.

Merges [30417] to the 3.7 branch.

Built from https://develop.svn.wordpress.org/branches/3.7@30421


git-svn-id: http://core.svn.wordpress.org/branches/3.7@30416 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix typo in style filter. props miqrogroove

Merges [30425] to the 3.7 branch.

Built from https://develop.svn.wordpress.org/branches/3.7@30429


git-svn-id: http://core.svn.wordpress.org/branches/3.7@30424 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Invalidate password keys when a user's email changes.

Merges [30430] to the 3.7 branch.

Built from https://develop.svn.wordpress.org/branches/3.7@30434


git-svn-id: http://core.svn.wordpress.org/branches/3.7@30429 1a063a9b-81f0-0310-95a4-ce76da25c4cd