Adding new registration methods to set moving and fixed transforms

Change-Id: Iff2f5366c40a3c841ea8c381d4073a7864be1997
Adding testing for the initial transforms

Change-Id: I5abcef163dde2e4783002d576c46a8eab474f30c
Adding doxygen documentation for initialize transform methods.

Change-Id: I64e6d946127414971fe644ede1003080223007ff
Merge topic 'SIMPLEITK-574_AddTransformInitialMethodsToRegistration' into next

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