Move common attr_accessors to base CMA::Case
Failing case for BAA

* Content not in conventional place (ol, not p)
* Cope with that
* Requires Kramdown to convert the list. Should be a no-op on existing p
Sports goods weirdness

* Content buried in first para after some br's
Add CMA::OFT::Case#add_detail

* Sets case body from a CASE_DETAIL page
Make the crawl as it stands finish, by

* Canonicalizing some links using Crawler::MAPPINGS where
  those links were for documents existing at more than one URL
* Adding some explicit Filename::MAPPINGS for unconventional URLs
  that wouldn't resolve to their Filename.for case filename (resulting in
  file not found errors)
* Temporarily not crawling assets
* Skipping things that 404 (only 2 at present)