Deprecate old CSS classes

ALL DEVS REVIEW PLEASE
(I don't want to break anything, so have a look just in case)
All these elements and classes are not used and/or should be deprecated:

`.u-underline`
`.cf`
`.h`
`h4`
`.type-1`
`.type-3`
`.type-4`
`.type-9`

![squirell!](http://i.imgur.com/7L6nPA4.gif)