Add --progress <arg> support
--progress <arg> option support: fix all dump_interval updaters.
Merge branch 'master' of git://github.com/JohnLangford/vowpal_wabbit
Add tests for new --progress option
better description for --quiet
remove redundant newline
make -o work when reference is missing; better tests for --progress
Add reference files for --progress
--quiet wins over --progress.  Default --progress is "2.0"
remove redundant types for progress_* vars from the constructor
Order change so no need to recompute progress_str
Merge branch 'master' of git://github.com/JohnLangford/vowpal_wabbit
Merge pull request #223 from arielf/master

New option: --progress <arg> with dual meaning