Merge pull request #1 from michaelsbradleyjr/master

sync session 1, stubs for sessions 2 and 3
Merge pull request #2 from michaelsbradleyjr/master

session-002 racket code so far (cleaning up for public repo)
Merge pull request #3 from michaelsbradleyjr/master

prefs, uniform line-length and session #3 wip
Merge pull request #4 from michaelsbradleyjr/master

more uniformity, main.rkt for group session-002
main.rkt for group session-003
Merge pull request #5 from stl-racket-laptop/master

main.rkt for group session-003