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 


@erictune indexing thing did not exist, but could be used to enforce namespace uniqueness.  I feel like the ACL/Namespace/Index proposals are all iterating to a common conclusion, it's just taking some time.