Merge pull request #157 from minrk/travis-no-parallel

don't run tests in parallel on travis

.travis.yml

@@ -6,10 +6,10 @@ python:
 - 3.4
 install:
 - pip install -e .
-- pip install pytest-xdist pyyaml
+- pip install pyyaml
 
 script:
-  - pytest -s -v -n4 tests/${REPO_TYPE}
+  - pytest -s -v tests/${REPO_TYPE}
 
 jobs:
   include: