Google Cloud SDK

The Google Cloud SDK is the new toolset from Google,
that allows developers to have a central tool to manage
all Google Cloud Platform Resources, including App Engine,
Compute Engine, Bigquery, Cloud Storage and others.

This PR makes the bin folder from the SDK available, so
more components installed will be available for users.

The caveat is that there is no "stable" version download URL.
If the current package contents change, the SHA1 sum must
be updated.