chg: test: use setup.py to manage test package instead travis

.travis.yml

@@ -4,7 +4,7 @@ python:
   - "3.4"
   - "3.5"
 before_install:
-  - pip install pytest pytest-cov pytest-catchlog hypothesis
+  - python setup.py develop
 install: "pip install -r requirements.txt"
 addons:
   apt: