(fix) Updated for chain.link.
(refactor) Use req.url API.
Merge pull request #7 from iron/fix/chain-link

(fix) Updated for chain.link.
(feat) Added cargo.
Merge pull request #9 from iron/feat/cargo

(feat) Added cargo.
Merge pull request #8 from iron/refactor/req-url

(refactor) Use req.url API.
(feat) Added favicon.
(doc) Documented favicon.
(feat) Added dynamic max-age to favicon.