rename config to config.json

[jedahan]

It would be nice to use file extensions, yeah?

[dominictarr]

It doesn't use file extentions because it follows the standards in https://github.com/dominictarr/rc (unconfigurable configuration loader)

[jedahan]

@dominictarr rc looks really cool!
If you are amicable to merging dominictarr/rc#85 that would be nice - I opened this issue after observing my friend have trouble getting started with scuttlebot.

Whether you merge or reject the idea, I will continue discussion in https://github.com/dominictarr/rc and leave this issue as a tracker for a) updating the rc dependency or b) closing.

[dominictarr]

thanks