Libnv improvements week 7

[Adam Starak]

Hello,
That was my first week after university exams. Finally I could spend numerous hours on GSOC project without worrying about other duties. The cnv api is finished. It still needs a kernel module test but I'm still learning about it. I also finished 2 way json conversion. I need to improve my tests a bit. Yesterday I started to read about rb tree which is my next milestone. 

Best regards 
Adam Starak