first attemp to tweak printout for holdout
Merge branch 'master' into save_best
printout tweak for gd, bfgs, oaa
finish coding all reductions
update test cases
Merge remote-tracking branch 'upstream/master' into save_best
add holdout_off to test 19
Merge pull request #147 from eHarmony/save_best

tweak printout for holdout