BUG: Coverity 1103595: Uninitialized pointer field

Also cleanup some style in itkVoronoiDiagram2DGenerator.h.

Change-Id: I88dd1262ae319ac6204262b21c409b23a75f82b0
BUG: Coverity 1081508: Uninitialized pointer field

Initialize member variable "ReceptorMemberCommand::m_This".

Also cleanup style of other constructor initializer lists in itkCommand.h.

Change-Id: Ia3d9e183cf2b7aa5079edf937f39b6ef25cb8926
ENH: Add a registration test for LBFGS-B optimizer

A new test is added that uses LBFGSB optimizer in the ITKv4
registration framework. Some issues are fixed to make the new test
successfully passed.
Also, duplicated examples from ITKv3 are removed. This avoids failures
while creating the ITK software guide.

Change-Id: I1620f03febc011e20b4558da020f7969a34bcbcf
Merge topic 'cov_1081508'

e6226461 BUG: Coverity 1081508: Uninitialized pointer field
Merge topic 'cov_1103595'

aa41b035 BUG: Coverity 1103595: Uninitialized pointer field
Merge topic 'AddLBFGSv4_both_4'

d513d36d ENH: Add a registration test for LBFGS-B optimizer