ENH: Test upper and lower bound of histogram.

Test previously only checked that an index was returned and
not the actual values of the index.

ITK-3206

Change-Id: I4268a622ebd3a2640458cbb6776e670a7918fc48
BUG: Include upper bound in last histogram bin.

ITK-3206

Change-Id: I1c3961ce0095aa5922c9a35a126ab84080e6aec9
BUG: Updated mean and standard deviation test values.

Changes occured due to fixes in itkHistogram.hxx

ITK-3206

Change-Id: I9d7646d14f87f7520cb0e88ffe3006401017b166
BUG: Update test data due to changes in itkHistogram.hxx

Ran unit test itkDemonsImageToImageMetricv4RegistrationTest2 and copied
data back to baseline in:

  itkDemonsImageToImageMetricv4RegistrationTest_I35_S1_T1_F0.nii.gz

ITK-3206

Change-Id: I40a68c95298913d631c7dcc3f1541a5b6ec9adc6
BUG: Fix uninitialized m_Spacing in SignedMaurerDistance

If PrintSelf was called before execution not value had been assigned
to the m_Spacing variable. This defect was detected by Valgrind on the
SimpleITK dashboard.

Change-Id: I206f9c6fb4fb4d524922e3fcf973051f3f165769
BUG: Don't print null bias field

Printing the N4BiasFieldCorrection before execution was causing a
segfault. Print "(null)" when null IVAR is encountered.

Change-Id: I1af252f0734ecd6d524cdd2eb7731a77d096b9cc
Merge branch 'release'
Merge topic 'map-last-endpoint-in-histogram'

3603ae9 BUG: Update test data due to changes in itkHistogram.hxx
05fa2aa BUG: Updated mean and standard deviation test values.
16bc4f7 BUG: Include upper bound in last histogram bin.
dfaeccb ENH: Test upper and lower bound of histogram.