Import RidgeRegression example

Conflicts:
	run
Minor clean up of the RidgeRegression code. I am not even sure why I did
this :s.
Add methods to normalize the data before training
Also update model after training based appropriately.
Add LPSA data set.
Data from
http://www-stat.stanford.edu/~tibs/ElemStatLearn/datasets/prostate.data
Revert back to closed form CV error
Add a unit test for Ridge Regression
Add LogisticRegression using StochasticGradientDescent.
Also refactor RidgeRegression and LogisticRegression to re-use code
and update the test as well
Add random data used for LR testing.
Verified that results match with glm in R
Address Reynold's comments. Also use a builder pattern to construct the regression classes.
Update test based on interface changes
Convert regression classes to builder pattern.
Remove extraneous methods and classes
Move normalization to MLUtils and remove Regression trait.
Clean up some comments.
Make regression arguments private and add method to predict one point
Use a private constructor instead of private vars
Fix logistic regression to not center data.
Also add a feature to get the intercept correct and test these
using a small unit test.
Move to regression, util and gradient packages
Removed dependency on Apache Commons Math
Initial implementation of Alternating Least Squares.

Includes unit tests and sample data to run on.
Remove unused import