Update Type System
Add CandSentFromQAPair.java and its descriptor and add it to
SimpleQuestionRunCPE, this AE will generate a list of candidate sentence
for each question-answer pair instead of just the question
Add AnswerScoreBaseClass.java and its descriptor and add it to
SimpleQuestionRunCPE, this AE is a base class for answer_score. Other
method to assign answer_score can extend this class and add itself to
the SimpleQuestionRunCPE.
Merge branch 'master' of https://github.com/troyhua/hw5-team10