switch to using Regexp::Common for delimited text

This library will be used for numbers and probably brackets pretty soon,
because it's better to use other peoples' regexen than make your own.
add verbose flag to start writing diagnostics

Now instead of just deleting the debugging print statements, I can keep
them around so other people can debug their own programs!

Allow setting the verbose flag via an environment variable so that
people running the automated tests can use it too.

Fixes #23
add raw numbers (int, dec, e, bin, oct, hex)

These are every number format that Perl or JS supports. We need to eval
the bin, oct, and hex so that Perl turns them into actual numbers
internally.

Also add the numeric comparison operators == and != so that we could
actually test this thing.

Fixes #17