HW3: add Test_CreateProbabilityTrainingDB()
Merge branch 'master' of https://github.com/haimshalev/NLP-Homeworks
HW3: TokenDiff() - counts the tokens differences between positive and negative responses

Signed-off-by: unknown <zkk12345@gmail.com>
HW3: TokenDiff() cahnge output files format
HW3: TokenDiff() add file spred
HW3: TokenDiff()improve performance
	old time :30 min
	current time: 15 sec

Signed-off-by: unknown <zkk12345@gmail.com>
HW3: TokenDiff() wrtie to filse total reviews count


Signed-off-by: unknown <zkk12345@gmail.com>
HW3: TokenDiff() add files sorted by by file spred


Signed-off-by: unknown <zkk12345@gmail.com>
HW3: TokenDiff() return feature dic, need to update the global var repVectorLen
Optimized the classify and the createProbabilityTrainingDB functions