Committer: Zhereng Zhang <zzhang@debian64VM.vmthing.com>

 On branch master
 Changes to be committed:
   (use "git reset HEAD <file>..." to unstage)

	modified:   README
 Changes to be committed:
   (use "git reset HEAD <file>..." to unstage)

	modified:   README
added the getPOS method
implemented the question rewrite part
implemented a self-learnign rewrite model
implemented a self-learning model
have a working version of learing algorithm
convert(sentence): convert the words in a sentence (in the dict form) to their base forms.
Merge branch 'master' of https://github.com/cuijiaxing/nlp

Updating`
Merge https://github.com/cuijiaxing/nlp
Fixed bug with words not in wordnet
Merge https://github.com/cuijiaxing/nlp
Another bug fix
Merge https://github.com/cuijiaxing/nlp
deep copy
Merge https://github.com/cuijiaxing/nlp
removed pygraphviz
added json converter
coreference
more stuff