Since ITK4.3.1 Get_vnl_vector is now called GetVnlVector, this change
has be made in BTK (see issue #53)
Since ITK4.3.1 SetRotationMatrix() of RigidTransform is now called
SetMatrix(), change has been made in btk. (see issue #53)
Since ITK4.3.1 SetNumberOfInputs in itk::ProcessObject is now called
SetNumberOfIndexedOutputs, changes has been made in btk. (close issue
Merge branch 'ITK4.3.1' into experimental