ENH: Add ExhaustiveOptimizerv4 to ITKv4 registration

Exhaustive optimizer is converted from the ITKv3 to v4 registration
framework. A test is designed for this newly converted optimizer
and is passed successfully.

Change-Id: I6972471e177b47e12343eb549afa995cda151ab2
Merge topic 'ExhaustiveOptv4'

02e2d273 ENH: Add ExhaustiveOptimizerv4 to ITKv4 registration