Export fixOrientation

Please export `fixOrientation` function, it think it is an useful method in other applications.
And these constants as well:

	orientationUnspecified = 0
	orientationNormal      = 1
	orientationFlipH       = 2
	orientationRotate180   = 3
	orientationFlipV       = 4
	orientationTranspose   = 5
	orientationRotate270   = 6
	orientationTransverse  = 7
	orientationRotate90    = 8