added target-accuracy option that will be asserted if you specify
moved POS and NER directories to also support train and test data filtering
updates to parser trainers to sample num sentences by portion
Merge branch 'master' of https://github.com/factorie/factorie into consistent-nlp-main-functions
small improvement to cl names
Merge pull request #73 from davidBelanger/consistent-nlp-main-functions

Consistent nlp main functions with ability to have accuracy-target tests