Playlists are video by default. props duck_

Merges [30422] to the 4.0 branch.


git-svn-id: https://develop.svn.wordpress.org/branches/4.0@30423 602fd350-edb4-49c9-b593-d223f7449a82
Fix typo in style filter. props miqrogroove

Merges [30425] to the 4.0 branch.


git-svn-id: https://develop.svn.wordpress.org/branches/4.0@30426 602fd350-edb4-49c9-b593-d223f7449a82
Invalidate password keys when a user's email changes.

Merges [30430] to the 4.0 branch.


git-svn-id: https://develop.svn.wordpress.org/branches/4.0@30431 602fd350-edb4-49c9-b593-d223f7449a82
TinyMCE: Verify HTML in captions. props azaozz

Merges [30435] to the 4.0 branch.


git-svn-id: https://develop.svn.wordpress.org/branches/4.0@30436 602fd350-edb4-49c9-b593-d223f7449a82
Press This: Ensure the error message is printed. props johnbillion

Merges [30438] to the 4.0 branch.


git-svn-id: https://develop.svn.wordpress.org/branches/4.0@30439 602fd350-edb4-49c9-b593-d223f7449a82
Better validation of the URL used in core HTTP requests.

Merges [30443] to the 4.0 branch.


git-svn-id: https://develop.svn.wordpress.org/branches/4.0@30444 602fd350-edb4-49c9-b593-d223f7449a82