Add a CNAME to try to resurrect scalaz.{com, org}.

See: https://help.github.com/articles/setting-up-a-custom-domain-with-pages
Tweak the new CNAME file.

Let's just get scalaz.org working first.
Remove hosting of scalaz.org.

It broke the URLs from scalaz.github.com.
v7.0.1 scaladoc
v7.0.2 scaladoc
v7.1.0-M1 scaladoc