fixed links to download Lab2_Notes.ipynb from github
added Lab3_Notes.ipynb
added task to clone cs109 2014 repos in lab3
added HW1-solutions.ipynb
added HW2.ipynb
added submission instructions to HW2.ipynb
fixed centering of example codein HW2.ipynb
fixed typo: misspelled senate
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