Merge topic 'SIMPLEITK-574_AddTransformInitialMethodsToRegistration'

f58c48fe Adding doxygen documentation for initialize transform methods.
95f04d99 Adding testing for the initial transforms
939cef2d Adding new registration methods to set moving and fixed transforms
fa1243c5 Adding documentation for SetInitialTransform method
c059562c Adding testing for registration transform inplace option
26d8ecb4 Rename registration SetTransform to SetInitialTransform
Merge branch 'master' into next

Change-Id: I4b29bf8e5fa20e32eeed48cb40e4308839d668b6