Add CI config

.gitlab-ci.yml

+Python 2.7 POCL:
+  script:
+  - export PY_EXE=python2.7
+  - export PYOPENCL_TEST=portable
+  - export EXTRA_INSTALL="numpy mako"
+  - curl -L -O -k https://gitlab.tiker.net/inducer/ci-support/raw/master/build-and-test-py-project.sh
+  - ". ./build-and-test-py-project.sh"
+  tags:
+  - python2.7
+  - pocl
+  except:
+  - tags
+Python 3.4 POCL:
+  script:
+  - export PY_EXE=python3.4
+  - export PYOPENCL_TEST=portable
+  - export EXTRA_INSTALL="numpy mako"
+  - curl -L -O -k https://gitlab.tiker.net/inducer/ci-support/raw/master/build-and-test-py-project.sh
+  - ". ./build-and-test-py-project.sh"
+  tags:
+  - python3.4
+  - pocl
+  except:
+  - tags