Revisit identifiers spec

Partially addresses #1135.

This is the result of discussions in the past few days about imprecision and confusion. Hopefully simpler. There are a few FIXME comments in the doc - discuss.
I specifically said "name" and "identify" - Maybe 2 and 3 are redundant?


On Mon, Sep 8, 2014 at 3:01 PM, bgrant0607 <notifications@github.com> wrote:

> In docs/identifiers.md:
>
> >
> > -4) The structure of a pod specification should stay largely the same throughout the entire system
> > +2) Uniquely name an object across space
>
> Why isn't #2 <https://github.com/GoogleCloudPlatform/kubernetes/issues/2>
> subsumed by #1
> <https://github.com/GoogleCloudPlatform/kubernetes/issues/1>?
>
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