cleaned up for next class
added mac page, cleaned up first lecture notes
most changes needed for first class.
cleaned up install instructions
added example for __main__ trick
a few changes
updated the install for mac page
cleaned up session 5 homework
updated session 06
clenaed up session 8 presentation
updated a slide in the last session
fix formatting errors resulting in bad build under `make slides`
fix slide custom css
fix slide configuration for me to be the sole presenter
update all sources to fix rendering problems for slides
more thematic additions for slides and html
begin fixing up session 1 slides
complete session 1 review, begin session 2 review
updates
new templates for first/last slides