added SQL exercises
modifying one of the solution
Renamed Pandas
Merge branch 'master' of https://github.com/mas-dse/DSE200-notebooks
renamed Pandas collection
gave Pandas notebooks new names that conform to the nbviewer setup
modifying grep regex script
Merge remote-tracking branch 'upstream/master'

Conflicts:
	lecture_2_github_io_numpy_pandas/10_exercises.ipynb