WIP
Change regex/pegex syntax. Add more evaluators. Add more tests.
Fix bug with tuple arguments.
add test case
Add boolean values
Add conditional expression
Add 'and' and 'or' expressions.
Add 'not' expression.
Use constants for true and false values.
Clean up evaluators. Add '+' and '*' operators.
Add more arithmetic operators.
Add unary minus operator.
Add '==' and '!=' operators.

Also, optionally cache recursive choices.
Use strict-mode.
Use node to run regression tests.
Move code to 'bootstrap' subproject.
Use "strict mode".
Cleanup: add documentation, move a couple files.
Fiddle with README
Merge pull request #1 from jvs/node-branch