first add of SAG algorithm
add randomization and begin javadoc
remove futile import
optimization to allow the jvm to vectorize some operations
add new linear classifier: stochastic average gradient (Le Roux 2012)
simplify test
bug fix: center kernel in kpca
add SDCA algorithm from Shalev-Shwartz (2013)
add SDCA to the demo
fix import
Add varying C parameter