#80 Check links in stories while editing

[Jamie McCarthy]

Somewhere during the story editing process, GET the <A
HREF> links and make sure they return valid responses.
Alert the editor to 404 links each Update and Save.

Keep a NewsVac-like table that caches responses so we
don't hit every link with every Update.

[Jamie McCarthy]

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Hm, maybe this is a job for Slash::Relocate...