Documentation on setting up scheme environment

Writen for emacs on Mac OS X only at this point.  But more is welcome.
Added links to book in the How section.
Add section on the first meeting
Final edit (?)

Did a quick pass, cleaned up some clear grammatical errors and added a bit more detail in a few places.
spell check pass
add reference to the mailing list in the intro paragraph
Move confusing Racket and Guile stuff to another file

I separated the file and added a placeholder for some ubuntu stuff.