deps: debug@1.0.4
deps: connect@2.24.0
deps: depd@0.4.2
deps: parseurl@~1.2.0
deps: send@0.7.0
Pass options from res.sendfile to send

fixes #2017
docs: replace Gittip badge
Fix req.protocol for proxy-direct connections

fixes #2252
3.15.0
Merge tag '3.15.0'