BUG: Update TransformReadWrite example.

Use .h5 instead of .meta for file extension.

TransformFileReader and TransformFileWriter are now templated.

Use a CompositeTransform.

Make sure the test is executed.

Change-Id: Iecb4435cc3fda8bbcdc454513f780f673b342379
Merge topic 'TransformExtension'

e917a600 BUG: Update TransformReadWrite example.