Proposal: Initial namespaces proposal

This is based on feedback and discussion that came out of #1017 

There was discussion that the term project may be problematic, so have removed it in favor of namespace.

I think this aligns nicely with the ACL model discussed thus far.

Feedback appreciated.

@erictune @lavalamp @smarterclayton 


I suggest that resources should be stored in etcd by their UUID, that namespace does not appear anywhere in the etcd path, and that an resource names do _not_ have to be unique within a namespace.