re-order things and clean up
remove stub
swap dim_reduc and clustering
re-org lemons
cleaning, moving python intro stuff
organizing a little more
clean up a little
clean up, move
add links to markdown files
clean up logistic/bayes
move things around
more links
fill out / join examples
moved things
shorten reference
move readings, add more questions
concatenate takes a tuple
add pycon links
add github cheat sheet
add Greg's post on command line