Added Session 4 slides
Merge branch 'master' of https://github.com/ga-students/DAT_SF_5
Merge branch 'master' of https://github.com/ga-students/DAT_SF_5
Minor changes
HW2 pdf upload
Merge branch 'master' of https://github.com/ga-students/DAT_SF_5
Added slides for lectures 5 and 6
Added slides for lecture 3 on APIs and JSON
Lab 7
HW2
Merge branch 'master' of https://github.com/ga-students/DAT_SF_5

Conflicts:
	iPython notebooks/HW1-Solution.ipynb