FlxPhysState.CreateWalls() improved.
Merge remote-tracking branch 'Beeblerox/flixelNME' into flixelNME
FlxPhysSprite mainBody renamed to body.

createWalls() variable name amends.
Merge pull request #194 from ProG4mr/flixelNME

FlxPhysSprite and FlxPhysState small amends: