--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
better error handling and user friendly error messages
Fix ExecCmd return inconsistency; ensure we return best loss in edge cases
Merge branch 'master' of git://github.com/JohnLangford/vowpal_wabbit
Add -b option and Brent's Method - not yet ready for prime time; fix edge-case of missing optimum
Add support for -t test-set; fix @$cmd vs $cmd bug in ExecCmd
better -t usage explanation
support invert_hash for multiclass problem
Merge pull request #142 from arielf/master

vw-hypersearch has new option to optimize against test set
Merge pull request #143 from eHarmony/truely_readable

support invert_hash for multiclass problem