add models from califorest experiment

[PranavHerur]

Pranav Herur
pherur2
CaliForest: Calibrated Random Forest for Health Data
CaliForest Paper

Adding models from original paper and the models from my extension work
models added:

1. CaliForest w/ Isotonic Regression
2. CaliForest w/ Logistic Regression
3. Random Forest with Venn-Abers Calibration
4. Standardized Threshold and Loops-Based Random Forest

[jhnwu3]

Dude this is super extensive, excellent work!

Highlighted for future reference.