Resolve "Add Unit Tests for splitData and getData processes"

Add initial CI for validating materialization of bag and testing docker abilities.

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated

• Close issue
  Closes #14 (closed)

/cc @ghenry @venkat.malladi

.gitlab-ci.yml

+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 singularity/3.0.2
+  - ln -sfn /project/BICF/BICF_Core/shared/gudmap/cookies/deriva-cookies.txt ./test_data/
+  - ln -sfn /project/BICF/BICF_Core/shared/gudmap/test_data/File_Q-Y53P.zip ./test_data/
+
+stages:
+  - unit
+
+unit:
+  stage: unit
+  script:
+  - singularity run 'docker://bicf/bdbag:1.0' bdbag --materialize ./test_data/File_Q-Y53P.zip
+  - singularity run 'docker://bicf/bdbag:1.0' bdbag --validate full ./test_data/File_Q-Y53P/
+  - if [[ $(md5sum test_data/File_Q-Y53P/data/assets/Study/Q-Y4H0/Experiment/Q-Y4BY/Replicate/Q-Y5F8/hMARIS_SIX2+_RiboDep#1.gene.rpkm.txt | awk '{ print $1 }') != $(cat test_data/File_Q-Y53P/data/File.csv | cut -d ',' -f10 | tail -1) ]]; then exit 21; fi;