Adding new rolls and slides.

I've added two new rolls and renamed the originals to meet current naming conventions. rollInLeft and rollOutRight also contain aliases for .rollIn and .rollOut to appease legacy users.

I've also added slideInUp and slideInDown ans they seemed to be the only versioons of the slides that were missing.

Finally, I added legal.css and shared.css. These are files specific to complete builds. The new GitHub page will use these to put together Animate.css builds.
Updating the README and the full source build.