--save_best_model based on holdout loss
add --save_no_win arg for early stopping
Merge branch 'master' into save_best
Merge branch 'master' into save_best
make it work for gd
holdout valid and early terminate for bfgs
test update for bfgs and clean up
make per_feature_regularizer compatible
bug fix so save other files when -f not speficied
cleaner feature mask
Merge branch 'master' into save_best
Merge pull request #139 from eHarmony/save_best

--early_terminate