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 


when a user POSTs a pod, I guess they already post to a namespaced path?  Does this mean /pods is dead, or that /pods is an alias to /namespaces/default/pods?