Add e2e tests

vendor/cloud.google.com/go/.travis.yml

@@ -0,0 +1,16 @@
+sudo: false
+language: go
+go:
+- 1.6
+- 1.7
+- 1.8
+install:
+- go get -v cloud.google.com/go/...
+script:
+- openssl aes-256-cbc -K $encrypted_a8b3f4fc85f4_key -iv $encrypted_a8b3f4fc85f4_iv -in key.json.enc -out key.json -d
+- GCLOUD_TESTS_GOLANG_PROJECT_ID="dulcet-port-762" GCLOUD_TESTS_GOLANG_KEY="$(pwd)/key.json"
+  ./run-tests.sh $TRAVIS_COMMIT
+env:
+  matrix:
+    # The GCLOUD_TESTS_API_KEY environment variable.
+    secure: VdldogUOoubQ60LhuHJ+g/aJoBiujkSkWEWl79Zb8cvQorcQbxISS+JsOOp4QkUOU4WwaHAm8/3pIH1QMWOR6O78DaLmDKi5Q4RpkVdCpUXy+OAfQaZIcBsispMrjxLXnqFjo9ELnrArfjoeCTzaX0QTCfwQwVmigC8rR30JBKI=