This emulator uses the same URL structure as the Cloud Datastore. Because gcloud-java depends on the google-cloud-datastore client, we need to wait until the client updates to use a variable to decide when to append "/datastore" for localhost URLs. (/cc @pcostell)

There are a couple related changes that need to be made:

• Update the version of the google cloud datastore client we depend on.
• The name of the script & folder will change from gcd to cloud-datastore-emulator. We should make the necessary updates to accommodate this change.
• We should also change the logic that checks for a locally-installed emulator to check for major/minor version updates (but not build). Right now, we do not check version (besides ensuring that the script is for v1beta3).
• Ensure the "gcd-emulator" version will be reported the same way as before by the gcloud SDK.