Changing the username description since we're only doing one user right now
Removing the closing PHP tag where it still was
Adding in documentation and throwing an exception if the ID isn't a tweet
Adding in a better description
Changing the name of the User Token and Secret to reflect Twitter's terminology
Added in the @ infront of the username box to clarify that it shouldn't be entered there
Addingin a default for the get_tweets so we don't need to pass anything
Changing the get_link function to private, since the result is accessible through the Tweet option and created during construct