Intro nb added
clean up and regression
preprocessor example
Regression nb
lars section
some more additions
revamp structure
refine lars and intro
Implemented Restricted Boltzmann Machines
updated NEWS file to include changes to the NeuralNets module
Modular API, minor fixes in CHAID
Merge pull request #2304 from khalednasr/rbms

Implemented Restricted Boltzmann Machines
minor doc changes in CHAID
Merge pull request #2305 from mazumdarparijat/documentation

Modular API, minor fixes in CHAID
Coverity scan defects fixed for RandomForest
Merge pull request #2307 from mazumdarparijat/documentation

Coverity scan defects fixed for RandomForest
cross-validation enabled for TreeMachine, added CART notebook
Modular API for RF and minor fixes
data submodule updated
Added support for softmax visible units and sampling with evidence to CRBM