git setup
lecture 4
updated lab 3, added lab4, added homework 1 key and hw2 files
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10
Update HW2
lecture 5
added lab5
ibranch 'master' of https://github.com/ga-students/DAT_SF_10

Conflicts:
	Labs/Lab3/DAT10-lab03.ipynb
Homeowkr 2