update gitignore
update gitignore

EdenMar/lonelyTwitter,genevag/lonelyTwitterOld,zuoyu/lonelyTweet,DT9/lonelyTwitter,yw2/lonelyTwitter,djphan/c301-LabRepo,chunhanlee/lonelyTwitter,joshua2ua/lonelyTwitter,Brigitte-Ng/LonelyTwitter