Resource Manager can't be used on a global basis

Resource Manager support was integrated in #860, but with many limitations:

these methods [are] currently implemented and unit tested, but not exposed to our docs:

resource.createProject

project.delete

project.restore

project.setMetadata

Right now, Resource Manager can only get a list of projects from a user and the metadata for them. Other operations (the ones above) return a 403.

@jgeewax

Carrying this over from #851:

Yea, creating right now can only be done by a "person". In Python, this works by first running gcloud auth login on the command-line.

Does gcloud-node pick up the Cloud SDK's credentials in the same way? If so, these will work nicely.

Eventually, service accounts will be able to create projects, but that isn't the case yet.

- @jgeewax

We do support the gcloud sdk's credentials (thanks to google-auth-library), but it still returns "The caller does not have permission" when trying to create a project. To confirm the credentials are being picked up, after doing gcloud auth revoke, the same API call returns "invalid_grant" instead.