Adding notebook for JSON lesson
Adding links to notebooks and a table of contents
Adding diagrams for two parts of setdict
Revert "Adding diagrams for two parts of setdict"

This reverts commit fcd027839f79c2064ba6817ab90992a0e5ef73a9.
Adding links to the notebooks
Putting entire lesson in notebook form
Starting to convert Python lesson to learner/instructor notebooks
Importing new people from 'site' repo
Loading JQuery locally
Regularizing format of setdict notebooks
Converting a few more parts of the Python intro to notebook form
Adding diagrams to setdict lessons
More conversions
Converted first shell lesson to notebook form
Converting more blocks-based Python to notebook form: problems with skimage.novice
Fixing the import, but problems remain
Diagrams and copy-editing for start of Python intro
Proof-reading lessons on types and grids
Renaming loop notebooks, fixing examples, and adding images
Converting the indexing notebook