homework for Day 2
Checking Day 01 answers
and update day01
Day 03 lectures
link to Day 3 slides in readme
Merge remote-tracking branch 'upstream/master'

Adding in new class notebooks.
 Changes to be committed:
	new file:   notebooks/.ipynb_checkpoints/Day_02_A_US_Census_API-checkpoint.ipynb
	- synced from upstream
	modified:   notebooks/Day_02_A_US_Census_API.ipynb
	- Filled in assignment