Update comment on how to get access token credentials
Merge pull request #3 from sachu/master

Update comment on how to get access token credentials in twitterstream.py
Assignment 1 Problem 0
Signed up for twitter and moved access tokens to config file so they won't go to github
Assignment 1 problem 2
Implemented term sentiment (Assignment 1 Problem 3)
Implemented frequency Assignment 1 Problem 4
Handle situations where trimming removes all content
Happiest state implementation (assignment 1 problem 5)
Implemented top ten, assignment 1 problem 6
Two fixes: add punctuation to frequency and top ten returns ten instead of one