Added nlp tools
Merged
Consolidated
retrieve sections
Merge branch 'handi'
Use lingpipe to retrieve snippet
added snippet precision and recall evaluation
added snippet precision and recall evaluation
Refactored Concept retrieve, snippet retrieve
Bug fixed in doc and snippet retrieval
merge from branchzhuang
Added complexQuery annotator
add output writer in concumer
Added answerExtractor
merge from zhuang
extrac basic list answer and output
add performanceinfo class
implement performanceinfo class
implement performanceinfo class