NGon: Adding textureAlongPath variable

For AntiAliasing: In order to be able to draw a texture along the path
of an Arc or a Hoop in an NGon, I have added an option to stretch a
texture along the path of the Hoop or Segment
beginMaterialFill and lineMaterial patched

The beginMaterialFill and lineMaterial methods should take the color and
alpha values from the material, not hard code it to 0xFFFFFF and 1
Fixing issue 109 - drawRect top left corner

Making drawRect close the rectangle properly, adjusting for
_strokeThickness in y-direction