examples: fix github view example

closes #2344
deps: connect@2.26.0
deps: media-typer@0.3.0
deps: debug@~2.0.0
deps: send@0.9.1
deps: fresh@0.2.4
deps: cookie-signature@1.0.5
deps: vary@~1.0.0
deps: range-parser@~1.0.2
deps: jade@~1.6.0
Support X-Forwarded-Host in req.subdomains
Support IP address host in req.subdomains

fixes #2308
3.17.0
docs: remove erroneous from history
Fix error in req.subdomains on empty host
3.17.1
Merge tag '3.17.1' into temp