fixed type problem in Module: our tokens don't have .value
Make some globals attributes of tokenize_asdl instead. +More cleanups
added asdl_ast as a separate file. removed printouts from the parser
Added a hacked up asdl_c.py from Python to see if it generates the same code
with my parser. IT DOES!!

As some point this ASDL stuff has to move into its own project and removed
from this one (only the parser should remain). But first I want to really
test-drive it for jscool2asm, and write a JS-emitter (for the tests a Python
emitter would also be nice)