remove behave from travis

.travis.yml

@@ -5,15 +5,8 @@ services: docker
 python:
   - "3.6"
 
-before_install:
-  # shutdown postgresql service so we can use the port
-  - sudo service postgresql stop
-  # wait for postgresql to shutdown
-  - while sudo lsof -Pi :5432 -sTCP:LISTEN -t; do sleep 1; done
-
 install:
-  - pip install -r requirements_test.txt
+  - pip install tox
 
 script:
   - tox
-  - behave --no-capture --no-capture-stderr tests/acceptance/features