Generic example code and generic function for random forests

This submission has simple examples and a generic function for random forests (checks out of bag errors, number of leaf nodes and estimates feature importance).
The example loads sample data and performs classification using random forests. This has code adapted from MATLAB documentation at http://au.mathworks.com/help/stats/treebagger.html
and from https://uk.mathworks.com/help/stats/ensemble-methods.html#bsx62vu
Downloads a breast cancer data from the UCI repository to perform regression
http://archive.ics.uci.edu/ml/machine-learning-databases/breast-cancer-wisconsin/breast-cancer-wisconsin.names