Merge pull request #166 from hal3/master

parallel learning updated, fixed threading bug, added classifier-based csoaa
standardizing driver
Merge branch 'master' of github.com:JohnLangford/vowpal_wabbit
adding make test makefile
normalizing sender driver
Added delimeter option to vw-csv2bin
learner definition rewrites
Merge pull request #167 from ericwhyne/master

Added delimeter option to vw-csv2bin
Merge pull request #168 from hal3/master

snapshotting now working for imperative searn
removed several drivers
Merge branch 'master' of github.com:JohnLangford/vowpal_wabbit
standardized nn driver
genericize oaa driver
more standard drivers
Merge branch 'master' of git://github.com/JohnLangford/vowpal_wabbit