fixed tutorialDominoes-Finished - this did not work #807
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I tried the tutorial with the dominoes but it did not work. I could never add
a new domino. There were three issues in the code.
a) The new domino was never added to the world.
b) The collision detection was always detecting a collision because
the new domino is in contact with the floor.
c) The tutorial description on the website is not related to
the code for the collision detection.
I fixed a) and b) and added some comments with this commit.
This change is