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
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10

Conflicts:
	Labs/Lab9/DAT10-Lab9-solution.ipynb
adding SQL & NoSQL lab
Delete .DS_Store
Delete DAT10 - SQL & NOSQL-sol.ipynb
Delete DAT10 - SQL & NOSQL.ipynb
Delete enron.db
Delete houses.csv
Delete rt_critics.csv
making changes to lab11
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10
making lab11 changes
Updated Syllabus
Lec11 and Lec12
Lab12s