session4
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
include pyplot
Merge remote-tracking branch 'upstream/master'
Session10
Merge pull request #12 from jcmoriar/master

Session10
Ran this notebook locally.
overwrote local changes
beginning 6.1
added content on 6.1 and 6.2
uploaded session 11 material
Merge pull request #13 from mattgiguere/master

session 11 materials
added nbviewer link
fixed typos
added back mistakenly deleted files

These two notebooks were deleted in a merge by mistake. This commit
adds them back.
Merge pull request #14 from mattgiguere/master

Fixed typos and re-added 2 notebooks
added directory for this week