updated lbfgs to support cuda tensors.

fixed the clone during dot products.
Merge pull request #21 from jonathantompson/cuda_lbfgs

updated lbfgs to support cuda tensors.
Merge pull request #23 from nicholas-leonard/master

fix Confusion bug
Added support for missing targets
Merge pull request #26 from nicholas-leonard/confusion

Added support for missing targets to ConfusionMatrix
add Nesterov Accelerated Gradient from @dilipkay
Added nag to init.