Determine how to share ipython notebook examples of bayeslite

[fsaad]

Related: #150

As it stand, the "examples" directory contains three instances of utilising bayeslite, and each of them is different.

• satellites
  And end-to-end session in BayesDB that shows capabilities of the system using various exploratory and inferential BQL queries. The notebook is complete within itself, and invites users to extend it.
• ma-school-districts
  A notebook created for the iap2016 probabilistic programming class, which attempts to explain some system abstractions (of which there are structural issues that need to be discussed separately from this ticket), contains TODOs and FILLMEs, and is intended for interactive completion by students.
• kepler
  A directory for reproducing the kepler example (bql and plotting code) from the BayesDB paper, using foreign predictors. Not exactly an "example" by itself.

We need to devise a strategy or taxonomy to clearly separate between "examples", "tutorials", and "reproducible research scripts" and other categories. Placing everything in the umbrella directory "examples/" is confusing and misleading.