update CI

ci/install_h5py.sh

-#!/bin/bash
-
-apt-get install -y libhdf5-10 libhdf5-dev libhdf5-openmpi-10 libhdf5-openmpi-dev hdf5-tools
-CC=mpicc HDF5_DIR=/usr/lib/x86_64-linux-gnu/hdf5/openmpi HDF5_MPI="ON" pip install --no-binary=h5py h5py

ci/install_mpi4py.sh

-#!/bin/bash
-
-apt-get install -y openmpi-bin libopenmpi-dev
-pip install mpi4py
-pip3 install mpi4py

ci/requirements.txt

 numpy
-cython
 matplotlib
 plotly
 nose
@@ -7,4 +6,3 @@ parameterized
 coverage
 git+https://gitlab.mpcdf.mpg.de/ift/mpi_dummy.git
 git+https://gitlab.mpcdf.mpg.de/ift/keepers.git
-git+https://gitlab.mpcdf.mpg.de/ift/D2O.git

ci/requirements_extras.txt

-ipython==5.3.0