IBS Metadata 0.1.3

Changes:
- Fixed parsing of the real IBS Details block (author, publisher, collection, date, pages, EAN).
- Fixed description extraction.
- Prefer physical book over ebook when title/author scores tie and no ISBN is supplied.
- Extra debug logging for parsed fields.


0.1.4
- Fixed NameError in result tie-break logic introduced in 0.1.3.
- No functional changes beyond this fix.


0.1.6
- Added calibre cover capability.
- Extracts cover URL from the matched IBS product page.
- Caches ISBN -> cover URL during identify().
- Implements download_cover().
- Rejects tiny or non-image responses.
