a more robust way to load --obj option

[yukulele]

Obj loaded as javascript file not really use javascript format but javascript fragment that is not very reliable (#65)

I suggest to use https://github.com/lorenwest/node-config to load data,
it's a robust node module for loading config.
It support a lot of format like javascript, json, json5, yaml.

[paul-f-maxson]

I believe you can use JSON instead of javascript