Merge pull request #3 from DevTeam-TheOpenBastion/dev

Dev
Record state of notebooks after each day's work
Add a small seection on slice objects.
Merge branch 'master' of github.com:DevTeam-TheOpenBastion/int-py-notes into post-recording
Add a short section about slicing objects.
Merge pull request #6 from DevTeam-TheOpenBastion/dev

Dev
Merge pull request #7 from DevTeam-TheOpenBastion/dev

Update requirements for ntoebook code support
Remove code_nbs directory
Add more matplotlib examples, and a warning notebook on closures
Hopefully, remove spacing differences
Ugly merge to ensure dev is synchronized