Added width and height to  `RenderArgs`
Added width and height to  `RenderArgs`

Closes https://github.com/PistonDevelopers/piston/issues/226

placrosse/piston,axelmagn/piston,PistonDevelopers/piston,getynge/piston,bvssvni/piston,PistonDevelopers/piston,KevinFrans3/piston,tempbottle/piston,Potpourri/piston,oldmanmike/piston,mitchmindtree/piston,caldwell/piston,bvssvni/piston