Code review comment for lp:~stefanor/ibid/rfc-plugin-330864

* Regex search should be case insensitive.
* cacheable_download() should include a default cachedir.
* I would prefer search results to include less information. The authors and
things like "(Format: TXT=43493 bytes)" aren't really useful. Possibly
something like:
5336: "SMTP Extension for Internationalized Email Addresses", September 2008,
EXPERIMENTAL

 review needs_fixing