Re: [presentation-api] Handling of nested browsing contexts.

Thanks for the pull! I committed some further clarifications to this 
branch:

* Defined "presentation is disabled" we can reference elsewhere in the
 spec
* Hooked that "presentation is disabled" into the entrypoint 
`navigator.presentation` (assuming the intended behaviour is to return
 null if presentation is disabled)
* Made the informative text in the Sandboxing section a note for 
clarity

@mfoltzgoogle Feel free to merge this PR, if you're happy with the 
clarifications.

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Received on Monday, 1 February 2016 10:57:25 UTC