add type codes

I made this using a few macros after just copy/pasting the pdf into
a vim window. Pretty crude, but effective.

Hey @bostonaholic, we should discuss this when we get the chance. I think this is pretty straightforward, but there are certainly other ways to do it that could be good or better. The goal is basically to give baizen clients access to this information about what a type code means. This exposes that info in what is probably the crudest way possible; maybe we want to find a way to bake this into the existing API instead of just exposing it as a hash... I dunno.