Merge branch 'fix_test' into 'master'

install missing dependencies for testing

See merge request !5

.gitlab-ci.yml

 image: continuumio/miniconda:latest
 
 before_script:
+  - curl -OLk https://raw.githubusercontent.com/openpathsampling/openpathsampling/master/devtools/conda_ops_dev_install.sh
+  - bash conda_ops_dev_install.sh
   - conda install -y nose coverage
-  - conda install -y -c omnia openpathsampling
-  - conda update -y --all
-  - conda uninstall -y openpathsampling
-  - git clone https://github.com/openpathsampling/openpathsampling.git
-  - cd openpathsampling && pip install -e . && cd ..
-
 
 test:
   script: