Feature Request: Ignore Existing Duplication

[Kerrick]

I'd love to start using JSInspect on our code base to make sure no new duplicated code is added. However, we have tens of thousands of lines of code already, some of which has duplications. I'd love to generate some sort of "ignore file" that saves a reference to each failure, and then have future runs point to that file to ignore existing failures while erroring on new ones, even in the same files that the old failures were in.

[capaj]

it would be nicer if it only inspected the files currently changed in git. Should be fairly trivial to implement.