Distorted Android

Fix for Bug 19: SWIRL effect: mess if Center out of Region.

revert latest changes to the fragment shader.
small things in DistortedObjects.

some improvements for the way we test DistortedObjects.

fix fragment effects :)

remove the 'Color' vertex attribute.

switch precision to low in fragment shader

Make the 'deform' effect continuous when 'center' point passes through (0,0) i.e. middle of the Object.

fix in vertex shader

Bugfix in vertex shader (vertices were shot into outer space if P==S, i.e. if center point was exactly equal to the vertex being computed)

Progress with Vertex3D