Fix for camera problems caused by issue #181 (fix for issue #66 issue fix).

Camera lerp argument pushed to the end of FlxCamera.follow() method to maintain backward compatiblity.
For some ugly reason, followLerp and followLead were static variables.
Added velocityIterations and positionIterations to FlxPhysState.
Merge pull request #184 from ProG4mr/flixelNME

Fix for camera problems caused by issue #181 (fix for issue #66 issue fi...