fixed typo about projection to 1st PC in Prob 1
added shorthand for PC1
fixed typo with the example code using .all()
synching
Merge branch 'master' of https://github.com/cs109/2014

Conflicts:
	.gitignore
	homework/HW0.ipynb
adding transcript for lecture 7
fixed x-axis label in 2(b) to per person (not per day) in HW1-Solutions.ipynb
fixed typos and added link to 9/23 lecture for help with SVD in HW2.ipynb
add lecture from 2014-09-24
fixed date
updated to Oct 31 (not Oct 12) in 1(c)
added Lab4_Notes.ipynb
fixed tags to show up in nbviewer
trying to change tags to raw code
tags back to markdown
Lab4 with cells run
updated lecture-polls.ipynb
added extra #yourcodehere in Prob 1(a) in HW2.ipynb
fixed spelling typo
added Lecture from 2014-09-30