Python parser

[brainkim]

https://github.com/brainkim/archieml-python
Spent a little time working on a python version of the archieml spec. It was a lot of fun to write. It's not used anywhere in production but it passes all the tests and then some, and the code is pretty.
I uncovered a couple edge-cases/bugs in the spec/reference implementations and filled out the ones that I could remember (#21, #22, #23, #24). Sorry for inundating you with emails!