Suggested Revisions for the Day 4 project

[pattyf]

The Day 4 project got a bit sidetracked by the complexity of section 4.4 Combine output dictionaries. So I added a section 2.4 to the attached solutions notebook and then reworked the rest of the code as one way to make it a bit more digestable. This file would need to be cleaned up a bit and then worked into the other two notebooks but I think it would be worthwhile because this is 95% great notebook.
UPR_Solutions-Patty-revisions.ipynb.zip