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.
"identifiers" - generic meaning for the title.


On Mon, Sep 8, 2014 at 3:00 PM, bgrant0607 <notifications@github.com> wrote:

> In docs/identifiers.md:
>
> > @@ -1,14 +1,15 @@
> >  # Identifiers and Names in Kubernetes
> >
> > -A summarization of the goals and recommendations for identifiers and names in Kubernetes.  Described in [GitHub issue #199](https://github.com/GoogleCloudPlatform/kubernetes/issues/199).
> > +A summarization of the goals and recommendations for IDs and names in Kubernetes.  Described in [GitHub issue #199](https://github.com/GoogleCloudPlatform/kubernetes/issues/199).
>
> s/IDs/uids/ (or UIDs?)
>
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