updated docs, added back github csv

[austingross]

• made certain functions private in Forecaster class
• added back the github csv in examples
• updated docs to support ipynb
• added requirements.txt to docs to support build in readthedocs.io

[zer0n]

The code change is massive, perhaps due to format or code structure changes, which makes it hard to review properly.

So, I will merge assuming that it's a positive gradient move :).