Initial import
Add PIP requirements file
Add introduction chapter
checked in
Add chapter 2
Add stream support for err, out
Updated cradle code from article.
Making room for expr2@precedence
Simplified code in expr1
Remove expr3 as unnecessary
Cut off expr1 at precedence stopping point
Get parens working
Finalize chapter 2 text, code.
Add ch03
Add bytecode module
Get more opcodes working
Finish up modifications to ch03
Add readme file
Add legal section
Delete old bytecode package