BF: on python 3.3 coverage/pytest are not cooperating - no coverage there

.travis.yml

@@ -36,7 +36,8 @@ install:
 # command to run tests
 script:
   - make localbuild
-  - coverage run -- `which pytest` -s -v tests/
+  - if [[ $TRAVIS_PYTHON_VERSION == 3.3 ]]; then COVERAGE=; else COVERAGE="coverage run"; fi
+  - $COVERAGE `which pytest` -s -v tests/
 
 #notifications:
 #  email: false