Added spaces in the commands outputs to be more readable
Filtered the attendees and prizes array when getting the event to remove null entries in the array
Added twitter username to Attendee;
The tweet message now takes first the attendee twitter username if exists otherwise takes the attendee Name;
Added more content to the tests
Changed some comments and added missing comments
Merge pull request #1 from danielcsgomes/feature/add-twitter-username

[Feature] add attendee twitter username