def mentioned_users(reply_all = true, screen_name = $bot[:config][:screen_name])
      userlist = [ self.user.screen_name ]
      if reply_all
        self.text.scan /@([A-Za-z0-9_]{1,16})/ do |user_name|
          user_name = user_name[0]
          userlist << user_name unless userlist.include?(user_name) or screen_name == user_name
        end
      end
      userlist
    end
def mentioned_users(reply_all = true, screen_name = $bot[:config][:screen_name])
      userlist = [ self.user.screen_name ]
      if reply_all
        self.text.scan /@([A-Za-z0-9_]{1,16})/ do |user_name|
          user_name = user_name[0]
          userlist << user_name unless userlist.include?(user_name) or screen_name == user_name
        end
      end
      userlist
    end
Scans the tweet text for screen names.
 @param reply_all [Boolean] Include all users in the reply.
 @param screen_name [String] The user's screen name (i.e. that one who clicked "Reply")
 @return [Array] An array of user names.