ENH: Convert DeformableReg examples to ITKv4 reg framework

This patch convert those DeformableRegistration examples that are used
in registration chapter of ITKSoftwareGuide to the ITKv4 registration
framework, and related explanations are added to the example files.
The metric section example is converted as well.

Change-Id: Ie756b644f855e1b58db90a79a0479d27044c43c6
BUG: Corrected processing of last sigma

The m_NumberOfSigmaSteps should reflect the true number of sigmas that are computed.
In the itkMultiScaleHessianBasedMeasureImageFilterTest, the
m_NumberOfSigmaSteps is set to 10, the lower sigma is 5, and the upper is 10.
But if the sigma values are printed out in
itkMultiScaleHessianBasedMeasureImageFilter.hxx while running the
test, only 9 sigma values are printed as follows:
5.000000 5.400299 5.832645 6.299605 6.803950 7.348672 7.937005 8.572440 9.258747

Clearly, the last sigma value is missing.  If the sigma value after
the loop is printed, it is 10.000000 with a non-zero number in a much
later digit.

This patch corrects the operation of the filter by changing the loop
and cleaning up some of the variables.
It also adds a regression image test since previously
there was none.

Change-Id: Iecdd472e5a990b5664f8db51c4732c744b08b33e
COMP: Allows latex to compile for ITKSoftwareGuide
Merge branch 'ImageRegistration20Test_release' into release

Change-Id: I0546b979b29d500447840a1785876402d8c50c97
Merge branch 'release'

Conflicts:
	Examples/RegistrationITKv4/ImageRegistration5.cxx

Change-Id: I7b140b9317d5f51e38169e6bf056480e681f446d
Merge topic 'CorrectMaxSigmaOfMultiScaleHessian'

82081935 BUG: Corrected processing of last sigma
Merge topic 'ConvertDefRegExplsToV4'

11c8939c ENH: Convert DeformableReg examples to ITKv4 reg framework