ENH: Add AmoebaOptimizerv4 to ITKv4 registration

Amoeba 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: I093e006ccd84f599fa94b43802237ab4db57eedd
Merge topic 'AmoebaOptv4'

2a11941b ENH: Add AmoebaOptimizerv4 to ITKv4 registration