[noise] Revision 13: rename "S" to "K"

[Trevor Perrin]

On Mon, Oct 19, 2015 at 11:37 AM, Jason A. Donenfeld <Jason at zx2c4.com> wrote:
> On Mon, Oct 19, 2015 at 8:24 PM, Trevor Perrin <trevp at trevp.net> wrote:
>> uglier and only helps this case, not others..
>
> In practice it's really just that one:
>
> 33: Noise_IK_25519_ChaChaPoly_BLAKE2s

There's "XXfallback" from Noise Pipes. And there are other patterns
you could create, not in this spec, that would need more complicated
names.  Plus there will be other curves, ciphers, and hashes, as time
goes by...

Trevor