add class exercise
updated lab 9 with example for normalization using pandas
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10
updates to solutions
added lab 10 on map reduce
Lec 10
qw
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10

Conflicts:
	Labs/Lab8/DAT10-lab8.ipynb
	Labs/Lab9/DAT10-Lab9.ipynb