Merge pull request #9 from chrislo/master

Meeting 8
Add spec to describe parsing scheme programs with embedded whitespace
Brute force version of whitespace tolerant grammar

I don't know that this is the cleanest solution, I guess there's a better one, but with rubyforge having gone away the treetop docs are AWOL :(
Add extra spec for whitespace tolerant nested things

Just in case.
Predicate methods return ruby booleans
Merge pull request #13 from h-lame/white-space-tolerance

White space tolerance. Closes #11.
Add examples for chapter five
Add examples for chapter six
Add support for parsing programs

So that we can handle arithmetic expressions like 1 + 2
Merge pull request #15 from mocoso/meeting-9

Meeting 9