Blender Git Loki

Correction to recent color balance compositor and sequencer changes.
- In my changes lift was acting like a second gamma.
- In blender 2.4x it was being added which gave ugly clipping.
- in Magic Bullet Looks it scales the color about 1.0: (col - 1 * (2-lift)) + 1

Did more testing and made sure the order of applying lift/gamma/gain works the same as MagicBulletLooks (tested on Collin's mac laptop).