Intro nb added
clean up and regression
preprocessor example
Regression nb
lars section
some more additions
revamp structure
refine lars and intro
some cleanups
more cleanups
add krr, examples and math
update the lbfgs optimizer
Reverting changes in data to fix broken build on develop
Merge pull request #2330 from lambday/develop

Reverting changes in data to fix broken build on develop
Update SubsetStack.cpp

remove warning, update license
Merge pull request #2268 from Saurabh7/regressnb

Regression nb
Update InferenceMethod.h

correct statement about marginal likelihood estimates
Implemented denoising autoencoders
update the unit tests for lbfgs
fixed memory leak in graph cut unit test