Adding testing for GetMatrix method

Change-Id: Iacf6714697339ce0b7fdaf1e450793a5045d20c5
Adding testing for transform SetMatrix method

Change-Id: I4f359236e1009eac1797ae847e952807a4422785
Merge topic 'SIMPLEITK-573_AddAdditionalTransformMethods' into next

8eb8b566 Adding testing for transform SetMatrix method
8c1cd9bf Adding testing for GetMatrix method