Fix Parsing Special Numbers

[Alexhuszagh]

Closes #1384, by adding logic to specially handle special floating-point numbers. This should correctly handle both streaming and complete parsers, and the unittests seem to confirm this, but a double-check of my logic would be appreciated.

[Alexhuszagh]

@Stargateur Speaking of which, I'm guessing it's a good idea to not mark any internal functions public? I did this somewhat because nom does it a lot internally, but it's probably not a good idea...

[Stargateur]

@Stargateur Speaking of which, I'm guessing it's a good idea to not mark any internal functions public? I did this somewhat because nom does it a lot internally, but it's probably not a good idea...

Oh, well, I think unless someone have a good reason yeah we should not introduce too many pub item.

[Alexhuszagh]

Ok I believe every requested change has been made.