code cleanups
unicode_literals
move rpython translator
RPython edits
parser fixup
fix Messageame parser bug
RPython edits
SequenceBox to handle parsing sequences
rpythonify definitions
RPythoninfy definitions
fixup parser expr building bugs
add __repr__ for expressions
diable
rpython tweaks
fix Derivative
cleanup getstr method
rpython strin nonneg stop slice
fix parser sequence bug
same -> __eq__
lexer token order