[MRG+1] CSS support in link extractors #983
I like this feature.
My only concern is backwards compatibility: a new option is inserted in the middle, so user code that uses positional arguments will be broken.
Using positional arguments is a bad style when list of arguments is long, but we're using it in Scrapy code ourselves (see super() calls).
+1 to merge this PR after converting link extractor super() calls to use keyword arguments.