October 17 notes, activies, and prepare hint

notes are posted, badge issues will follow soon and question answers later tonight

help on the prepare:

I used git log c10..c11 --pretty=oneline to get:

586fb07 Merge branch 'c11_notes'
5638fa9 first pass and ac;
8cf4636 update schedule
73951e4 cleanup
c86507c export prep
084d5d7 cleanup
e58cd2b closes #9
c76db26 readability improvements and legend
bb86a82 rm typo
41a7845 link notes
be848e9 add lab scheudle
c7f336b actual updated schedule
a04f90c question answers!