fix: Try forcing httplib2 installation to fix GCP deploy on Travis

Author: Ben Vinegar

.travis.yml

@@ -17,6 +17,7 @@ jobs:
         - PATH=$PATH:${HOME}/google-cloud-sdk/bin
           PYTHONPATH=${PYTHONPATH}:${GAE_PYTHONPATH} CLOUDSDK_CORE_DISABLE_PROMPTS=1
       before_install:
+        - pip install httplib2
         - if [ "$TRAVIS_BRANCH" != "master" -o "$TRAVIS_PULL_REQUEST" != "false" ]; then travis_terminate 0; fi
         - openssl aes-256-cbc -K $encrypted_3108ac7e9a1f_key -iv $encrypted_3108ac7e9a1f_iv
           -in .travis/credentials.tar.gz.enc -out credentials.tar.gz -d