ENH:  Added B-spline registration test.

This test demonstrates how to run a multi-level
B-spline transform initialized by an affine transform
using the ITKv4 registration framework.  Also
includes the use of the scales estimator.

Change-Id: Ida34bbb302714e071d311ea32045b6e347772984
Merge topic 'BSplineImageRegistrationv4Test'

94adc51 ENH:  Added B-spline registration test.