Fixed Eq. Triangle

I fixed the equilateral triangle so that is now works. That was some fun
math. I have been really trying to get the dragging right, but still
haven't achieved it. I will continue working at it.
Big Fix

This Commit will fix some of the bigger issues. I made some changes to
the Ex. Triangle to bring it inline with the other shapes dimensions.
Next and even bigger after going back and looking through our notes I
studied Box3D joints again on Dana's recommendation. After some
searching I found what I was looking for. Block movement is now
effective and pretty! In addition grabbing at the center of an object
allows you to move it without rotation.
On another note I changed the scaling ratio in physicsZone, some of the
shapes are still not quite right yet though.