Blender Git Loki

* New feature on compo scale node: "Scene Size %"

This option sets the relative scaling factor to the amount set in the
scene "100%/75%/50%/25%" buttons. It's useful when you've got a fixed
background image, and want to do preview renders at a lesser
percentage, so you don't have to go and change the scale node each
time you change the %.

Also removed unnecessary use of a global from texture node.