Update h5py dependency to version 2.2.1
Update h5py dependency to version 2.2.1

This is required, because there is no other version on PyPi anymore and some
modules of CATMAID depend on h5py.

fzadow/CATMAID,fzadow/CATMAID,fzadow/CATMAID,htem/CATMAID,fzadow/CATMAID,htem/CATMAID,htem/CATMAID,htem/CATMAID