More prominent positions are given to authors with more commits, in
steps of magnitude. Authors with 100-999 commits are listed before
authors with 10-99 commits. Yes, this puts me at the head of the list
and is a slight ego trip, but I still think it's the right thing to do.
- Move the Go files into script/ instead of random places
- Rewrite check-contrib.sh into check-authors.go and check-copyright.go
- Clean up build.sh a little bit
