Give pip package test stage its own script

Author: fefi42

.travis.yml

@@ -69,7 +69,7 @@ jobs:
         - pip install -r requirements.txt
         - pip install .
       script:
-        - python integration/rdf.py
+        - python integration/pip_package.py
 
 #    - stage: "Build documentation"
 #      language: python

integration/pip_package.py

@@ -0,0 +1,4 @@
+import weaviate
+
+x = weaviate.SEMANTIC_TYPE_ACTIONS
+print("imported weaviate successfully as package")