Add Animoto to the list of oEmbed providers. Example video: http://animoto.com/play/MlRRgXHhoT8gOZyHanM6TA.

Props lritter.
Fixes #28265.



git-svn-id: https://develop.svn.wordpress.org/trunk@28790 602fd350-edb4-49c9-b593-d223f7449a82