Removing unused
Adding sentiments to dictionary
Adding function to calculate score
Refactoring calculate_score function to return score and new tokens (i.e. not present in the sentiments dictionary)
Adding skeleton for processing the list of tweets
Adding update_new_terms helper
Adding process_new_terms helper
Adding handler for empty tweets
Fixing dictionary iteration error
Switching to simple s.split()
Merge branch 'problem-3' into ex1