Enhancements

[tlienart]

(see readme)

• LARS see LARS.jl

• Quantile regression see [QuantileRegression.jl] (https://github.com/pkofod/QuantileRegression.jl)

• glmnet see GLMNet wrapper

• prox Newton or L-BFGS (see also https://github.com/yuekai/PNOPT; and paper https://arxiv.org/pdf/1206.1623.pdf as well as https://papers.nips.cc/paper/5384-proximal-quasi-newton-for-computationally-intensive-l1-regularized-m-estimators.pdf)

• count -- http://hua-zhou.github.io/media/pdf/ZhangZhouZhouSun17mglm.pdf

Other stuff

• add option for size of tape in LBFGS solver(s)
• add option(s) for linesearches
• add and test options generally for solvers