* ~~#79~~ Autoload ASDF when calling `REQUIRE` the first time. User's no longer have to explicitly load ASDF anymore.
* ~~#80~~ Use ASDF to load contribs. cmu-contribs still exists but does nothing. The contrib names are the same, except it's best to use a keyword instead of a string. So, `:contrib-demos` instead of `"contrib-demos"`.