Make changes discussed in https://github.com/AlekSi/nut/issues/28
Fix small issues described at https://github.com/yvasiyarov/nut/commit/590bc49ef1a45eaf3577dcc7cbb2d4e019135a05#commitcomment-3160333
Merge pull request #33 from yvasiyarov/develop

Tweaks for .nut.json loading. https://github.com/AlekSi/nut/issues/28