Storage auth only occurs on non pull requests.

adding brewfile to simplify mac development

.travis.yml

@@ -62,6 +62,6 @@ before_install:
 - if [ ! -d "$HOME/google-cloud-sdk/bin" ]; then rm -rf $HOME/google-cloud-sdk; export
   CLOUDSDK_CORE_DISABLE_PROMPTS=1; curl https://sdk.cloud.google.com | bash; fi
 - source /home/travis/google-cloud-sdk/path.bash.inc
-- if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then - gcloud auth activate-service-account --key-file AUTH_KEY.json
+- if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then - gcloud auth activate-service-account --key-file AUTH_KEY.json; fi
 - if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then rm AUTH_KEY.json; fi
 - rm AUTH_KEY.json.enc