Revert "Running py.test directly in travis instead of setup.py test"

This reverts commit cbf817f.

Author: nicoddemus

.travis.yml

@@ -39,7 +39,7 @@ before_script:
 
 script:
  - python setup.py develop
- - coverage run --source=pytestqt py.test pytestqt
+ - coverage run --source=pytestqt setup.py test
 
 after_success:
  - coveralls