duckduckgo/zeroclickinfo-spice — pull request #1180 by mwmiller (2014-10-18 14:33:16+00:00)
Title: ISBN: allow for bare ISBN entry.

We'll trigger if there are at least 10 digits plus spaces and dashes
in a row.

Then clean it up and see if we can find just 10 or 13 digits in a row
which pass check digit verification. If so, we rock on.

Addresses #1169.