[ITK] HDF5 enhancements

[David Froger]

Dear all,

I just push this to Gerrit (ITK):

http://review.source.kitware.com/16576
http://review.source.kitware.com/16577
http://review.source.kitware.com/16578
http://review.source.kitware.com/16579

to fix the test of HDF5 write streaming, and add pasting support for HDF5.

and this (ITKExamples):

http://review.source.kitware.com/16580

to add examples about streamnig and pasting HDF5 files.

The commits are not perfect, but I would be happy to discuss its content and
to have feedback.

Especially:
- I introduce a 'ChangeRegionImageFilter', that may be replaced by something
  already existing, but I didn't find what. (Furthermore, the implementation is
  not optimal, it make a useless copy).
- For the ITKExamples, I didn't find how to build the html documentations from
  the rst files, so I didn't test it.
- For the ITKExamples, I didn't succced yet to upload the input binary files.
- For the ITKExamples, the last example may not work yet.

Best,
David