stage_poly: missed a debugging print
stage_poly::setup adds --stage_poly model header

this fixes a reported crash when run on existing model without
--stage_poly (which caused gd::save_load to be called before
stage_poly::save_load)
stage_poly: use calloc_or_die_gruesomely
stage_poly: constant needs multiplier

(relevant for --oaa and other multiple-predictor reductions)
stage_poly: misc cleanup
stage_poly: handle ft_offset
stage_poly: update ec predictions after reduction
stage_poly: support update / reduction interaction

This makes it so that multiple invocations of the same example (due to
reduction) only trigger a single support update.
Merge branch 'master' into oaa_fix
Merge pull request #341 from wfenchel/oaa_fix

--oaa fix
Clean handling of 'vw' failures.
vw-top-errors: add comments + make output wide-char safe + more sensible defaults for topN examples/features
Merge branch 'master' of git://github.com/JohnLangford/vowpal_wabbit
Merge pull request #343 from arielf/master

vw-top-errors: handle and report vw failures cleanly
pulled ezexample into vw instead of library, added library to runtests
added missing files
minor tweaks
Merge pull request #346 from hal3/master

pulled ezexample into vw instead of library, added library to runtests
fixed bug that arises if you do not snapshot but still want auto-history; improved results on argmax task
fixed holdout bug