Make this a cpanish bundle

[doherty]

It'd be nice to make this a cpan-style thing so it can be installed with the usual Perl toolchain.

At a glance that might mean:

• bin/script directory for the executable
• lib directory for the library files you will split off from the current single file
• install tool like Build.PL
• something to automatically fatpack it all so you can still distribute it as one file?
• changelog
• test suite

This is really just a more concrete goal than #23. I'm sure @wchristian is thinking about these things as well.