Merge branch '80-concurrent_issue' into ci-merge-test

.gitlab-ci.yml

-variables:
-  GIT_DEPTH: 5
-  GIT_CLONE_PATH: $CI_BUILDS_DIR/$CI_RUNNER_SHORT_TOKEN/$CI_PROJECT_NAME/$CI_PIPELINE_ID/$CI_CONCURRENT_ID/$CI_JOB_ID/
-
-
 before_script:
   - module add  python/3.6.1-2-anaconda
   - pip install --user pytest-pythonpath==0.7.1 pytest-cov==2.5.1
   - module load nextflow/0.31.0
-  - ulimit -c unlimited
   - ln -s /project/shared/bicf_workflow_ref/workflow_testdata/chipseq/*fastq.gz test_data/
 
 stages: