Drop 'formal semantics' from the deliverable list

The current text in the list of deliverables includes:

> A technology-neutral permissions and obligations information model with formal semantics

This may be dangerous as part of an official deliverable text. The term “formal semantics” is, in many respect, a very loaded term and may mean the development of some sort of a mathematical model to express the model which can become very complex and difficult to understand. Consider, for example, the [prov formal semantics document](http://www.w3.org/TR/2013/NOTE-prov-sem-20130430/). I do not think we should put this into a "required" list of deliverables.

Ivan

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Ivan Herman, W3C
Digital Publishing Lead
Home: http://www.w3.org/People/Ivan/
mobile: +31-641044153
ORCID ID: http://orcid.org/0000-0003-0782-2704