https://github.com/GoogleCloudPlatform/google-cloud-python/blob/master/docs/vision-usage.rst#manual-detection wah? https://github.com/GoogleCloudPlatform/google-cloud-python/blob/master/vision/google/cloud/vision/image.py#L88 documentation written by @daspecster https://github.com/GoogleCloudPlatform/google-cloud-python/commit/95a55c145bd2e16e80e34e180682932c8a16199a
