README - added contributor thanks
Make the dice red
set clear colour on fbo to prevent black edges on dots
bigger font on button
fixed reading in of config
Fixed FBO rendering problem caused by gl_FragCoord

gl_FragCoord is relative to the frame buffer's origin,
which Kivy gives no way of determining. Switched to
using a variable set up by a vertex shader.
Fixed blending artifacts while rendering dots.

This caused a black outline when rendering on the
new red dice background.