Add docker testing framework

.gitlab-ci.yml

-#image: ubuntu:artful
-image: debian:testing-slim
+image: parras/nifty:latest
 
 stages:
   - test
@@ -8,35 +7,41 @@ stages:
 variables:
   DOCKER_DRIVER: overlay
 
-test_python2:
+test_python2_scalar:
   stage: test
   script:
-    - apt-get update > /dev/null
-    - apt-get install -y git libfftw3-dev openmpi-bin libopenmpi-dev python python-pip python-dev python-nose python-numpy python-matplotlib python-future python-mpi4py python-scipy > /dev/null
-    - pip install --process-dependency-links parameterized coverage git+https://gitlab.mpcdf.mpg.de/ift/pyHealpix.git > /dev/null
-    - pip install --user .
-    - OMP_NUM_THREADS=1 mpiexec --allow-run-as-root -n 2 nosetests -q 2>/dev/null
+    - python setup.py install --user -f
     - nosetests -q --with-coverage --cover-package=nifty4 --cover-branches --cover-erase
     - >
       coverage report | grep TOTAL | awk '{ print "TOTAL: "$6; }'
 
-test_python3:
+test_python3_scalar:
   stage: test
   script:
-    - apt-get update > /dev/null
-    - apt-get install -y git libfftw3-dev openmpi-bin libopenmpi-dev python3 python3-pip python3-dev python3-nose python3-numpy python3-matplotlib python3-future python3-mpi4py python3-scipy > /dev/null
-    - pip3 install --process-dependency-links parameterized git+https://gitlab.mpcdf.mpg.de/ift/pyHealpix.git > /dev/null
-    - pip3 install --user .
+    - python3 setup.py install --user -f
     - nosetests3 -q
-    - OMP_NUM_THREADS=1 mpiexec --allow-run-as-root -n 2 nosetests3 -q 2>/dev/null
+
+test_python2_mpi:
+  stage: test
+  script:
+    - python setup.py install --user -f
+    - OMP_NUM_THREADS=1 mpiexec -n 2 nosetests -q 2> /dev/null
+  only:
+  - NIFTy_4
+
+test_python3_mpi:
+  stage: test
+  script:
+    - python3 setup.py install --user -f
+    - OMP_NUM_THREADS=1 mpiexec -n 2 nosetests3 -q 2> /dev/null
+  only:
+  - NIFTy_4
 
 pages:
   stage: release
   script:
-    - apt-get update > /dev/null
-    - apt-get install -y git libfftw3-dev python python-pip python-dev python-numpy python-future python-sphinx python-sphinx-rtd-theme python-numpydoc > /dev/null
-    - pip install --user .
-    - sh docs/generate.sh > /dev/null
+    - python setup.py install --user -f
+    - sh docs/generate.sh
     - mv docs/build/ public/
   artifacts:
     paths: