multinomial_naive_bayes

multinomial_naive_bayes
remove old svn files
Update README.txt

Added explanation of the subfolders
Removed Mariana's solution from the labs folder, will add to code folder.
This code still has the wrong normalization, but I've changed variable names and added comments for clarity
Fixed wrong normalization in Naive Bayes. Also implemented correct add-one smoothing.
Changed version to give to students to use clearer variable names, added comments, etc.
Turned smoothing off by default. Also removed variables related to smoothing from code for students.