4.9.0

• Add res.sendStatus
• Invoke callback for sendfile when client aborts
  • Applies to res.sendFile, res.sendfile, and res.download
  • err will be populated with request aborted error
• Support IP address host in req.subdomains
• Use etag to generate ETag headers
• deps: accepts@~1.1.0
  • update mime-types
• deps: cookie-signature@1.0.5
• deps: debug@~2.0.0
• deps: finalhandler@0.2.0
  • Set X-Content-Type-Options: nosniff header
  • deps: debug@~2.0.0
• deps: fresh@0.2.4
• deps: media-typer@0.3.0
  • Throw error when parameter format invalid on parse
• deps: qs@2.2.3
  • Fix issue where first empty value in array is discarded
• deps: range-parser@~1.0.2
• deps: send@0.9.1
  • Add lastModified option
  • Use etag to generate ETag header
  • deps: debug@~2.0.0
  • deps: fresh@0.2.4
• deps: serve-static@~1.6.1
  • Add lastModified option
  • deps: send@0.9.1
• deps: type-is@~1.5.1
  • fix hasbody to be true for content-length: 0
  • deps: media-typer@0.3.0
  • deps: mime-types@~2.0.1
• deps: vary@~1.0.0
  • Accept valid Vary header string as field