Run integration tests as part of CI (after #129) (#131)

* Run CI scripts on both Mac and Linux

* Fix AuthTests for macOS

* Use SocketsHttpHandler

* Install minikube on the Travis CI servers

* Add integration tests

* Fix an issue where StreamConnectAsync would crash if the credentials were not set

examples/nginx.yml

@@ -0,0 +1,10 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: nginx
+spec:
+  containers:
+  - name: nginx
+    image: nginx:1.7.9
+    ports:
+    - containerPort: 80