made BagOfWordVariables general to Map.
Beginning of within to cross-doc coref.
First draft* for Chinese POS tagger

*First draft with Professor McCallum's new generic POS tagger
architecture
Fixed some minor bugs
Added companion object for CtbChainPosTrainer
Started
Added loadingMethod arg to ChainPosTrainer
Altered loadingMethod to PennPos companion object
Started making the trainer generic to language
Fixed a typo in declaration of ChainPosTrainer
Trying to make the trainer agnostic to tagger
Still trying to make the trainer agnostic to tagger
More trying to make the trainer agnostic to tagger
Even more trying to make the trainer agnostic to tagger
Making ChainPosTagger abstract
Fixing minor bugs with IO and the domain
Fixing small IO bugs
Should fix the IO error with underscores
Definitely fixes the underscore error
Put println updates in main of ChainPosTrainer