use merge so empty objects don't kill settings

[dylang]

Switched from extend to merge so that a config file can have defaults and the passed in config variable can overright any defaults without requring every property to be set.

Hypothetical pseudocode example:

jshint.json:

jshint: {
   // all these settings
}

and

config option

{
  jshint: {
    // i just want to overwrite one option, not replace the whole object.
  }
}

[jgallen23]

looks great. Can you add a test for it?

[dylang]

I added an assert that fails when extend is used instead of merge.

[jgallen23]

thanks

[jgallen23]

npm published 0.6.1 which contains this

[dylang]

Thanks, works great!