Json benchmark and conformance

[petke]

Your json library did well in this benchmark I happened to come across. Its the fastest C++11 json library. (I'm using the cpprest json library at the moment, and am thinking of switching.)

However the "conformance" on your library was below average. Maybe you can do something to improve it.

https://github.com/miloyip/nativejson-benchmark

[vivkin]

I'm check all conformance test which fail gason. All of this is checked in gason itself:
https://github.com/vivkin/gason/blob/master/src/test-suite.cpp#L30
and I think it's not an issue "extra comma" or other things. All of this is explained in readme