[noise] Test vector format

[Jonathan Rudenberg]

> On Apr 7, 2016, at 11:10, Alex <alex at centromere.net> wrote:
> 
> On Thu, 7 Apr 2016 11:02:14 -0400
> Jonathan Rudenberg <jonathan at titanous.com> wrote:
> 
>> I’m fine with this. I think empty fields could just be an empty
>> string? ("")
>> 
> 
> You need to differentiate between PSKs being disabled and PSKs being
> enabled, but which use the empty string.

Ah. JSON does have a way of doing this: null

Not sure if that would hurt parsing on the platforms that Trevor is thinking of.

Jonathan