initial macrodef documentation
Make `with` return the last expression from its branch

Thanks @rwtolbert for the bug report
better macro example
documentation for global
Fixes a mistake (most probably a typo) in the tutorial.
Merge pull request #260 from rahmu/master

Fixes a mistake (most probably a typo) in the tutorial.
fix to assoc docs + new multiassoc definition
documentation for require
working on documenting macros
cond documentation
working on documenting builtins
clarified rest / cdr, cleaned up require
Merge branch 'master' into pr/258
Merge branch 'master' into pr/263
Merge branch 'master' into pr/262