added users script to print out users in a batch of tweets
added users script to print out users in a batch of tweets

kevinbgunn/twarc,ericscartier/twarc,edsu/twarc,remagio/twarc,miku/twarc,DocNow/twarc,remagio/twarc,kevinbgunn/twarc,miku/twarc,ericscartier/twarc,hugovk/twarc