Removed dirty property, optimized update loop, refactored postUpdate for fixed time step
Removed dirty property, optimized update loop, refactored postUpdate for fixed time step

spayton/phaser,pixelpicosean/phaser,TukekeSoft/phaser,spayton/phaser,TukekeSoft/phaser,mahill/phaser,englercj/phaser,photonstorm/phaser,photonstorm/phaser,mahill/phaser,BeanSeed/phaser,TukekeSoft/phaser,BeanSeed/phaser