Update tweetDog

In order to run this sketch, add the jpg, "arthur.jpg", found at https://f.cloud.github.com/assets/5541270/1655109/d6b444a8-5b5b-11e3-867a-4aa92bac423f.jpg, to this sketch

In order to run this sketch, add the sound file, "artiesound.wav", found at www.heathersimmons.ca/personal.html, to this sketch