* Bail out if lang cannot be inferred and is not given on cmdline
* exe/httpspell:    # TODO: --recursive, defaults to false
* exe/httpspell:    # TODO wget has some additional options for recursive behavior that should be reviewed
* exe/httpspell:  # TODO: Find sections with a lang attribute and handle them separately
* lib/httpspell/spider.rb:          # TODO Print _which_ entry of the blacklist matches
* lib/httpspell/spider.rb:        # TODO Ignore same page links (some anchor)