Refactored code order, removed non-necessary classes
Refactored some stuff from BartStep to new BartModel class, finished BartStep class
Added documentation to BaseTree class.
Finished adding documentation to all classes.
Working on BartModel
Finished BartModel and started BartSample classes.
Merge branch 'trees-proposal'.
Fixed up plink, filter, and predict methods.
Merge branch 'master' of https://github.com/acbecker/CART