Re: [presentation-api] Clarify presentation ID generation requirements

See [discussion at 
TPAC](http://www.w3.org/2016/09/22-webscreens-minutes#ins01)

**ACTION:** @mfoltzgoogle to check how other specs reference UUID 
generation and adjust the spec accordingly with SHOULD or MUST

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Received on Monday, 26 September 2016 12:07:58 UTC