ignore option does not work

[simonihmig]

Seems there is a mismatch of function params:

• https://github.com/vastec/ember-unused-components/blob/master/lib/analyser.js#L359
• https://github.com/vastec/ember-unused-components/blob/master/lib/analyser.js#L378

But also when I change the invocation to pass config, the filename is something like ./app/..., so does not really match what the documentation says.