Support Cloud Storage library on local App Engine development server #1276
Description
This is somewhat related to #684 but not exactly. I would like to use this library with the existing App Engine development server, not a separate server, because I would need Blobstore and Images APIs to have access to the blobs uploaded through GCS API and use GCS API to read blobs uploaded through Blobstore. Currently the GCS App Engine library contains only a subset of the functionality (I guess it was meant to cover only the functionality that's not in Blobstore API). I would like to gradually replace usage of Blobstore API and GCS GAE with this library.