Update dependency express to v4.16.0 (feature_branch)

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This PR contains the following updates:

Package	Type	Update	Change
express (source)	dependencies	minor	4.15.5 -> 4.16.0

By merging this PR, the below issues will be automatically resolved and closed:

Severity	CVSS Score	CVE	GitHub Issue
High	7.5	CVE-2017-16138	#2

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Release Notes

expressjs/express

v4.16.0

Compare Source

===================

• Add "json escape" setting for res.json and res.jsonp
• Add express.json and express.urlencoded to parse bodies
• Add options argument to res.download
• Improve error message when autoloading invalid view engine
• Improve error messages when non-function provided as middleware
• Skip Buffer encoding when not generating ETag for small response
• Use safe-buffer for improved Buffer API
• deps: accepts@~1.3.4
  • deps: mime-types@~2.1.16
• deps: content-type@~1.0.4
  • perf: remove argument reassignment
  • perf: skip parameter parsing when no parameters
• deps: etag@~1.8.1
  • perf: replace regular expression with substring
• deps: finalhandler@1.1.0
  • Use res.headersSent when available
• deps: parseurl@~1.3.2
  • perf: reduce overhead for full URLs
  • perf: unroll the "fast-path" RegExp
• deps: proxy-addr@~2.0.2
  • Fix trimming leading / trailing OWS in X-Forwarded-For
  • deps: forwarded@~0.1.2
  • deps: ipaddr.js@1.5.2
  • perf: reduce overhead when no X-Forwarded-For header
• deps: qs@6.5.1
  • Fix parsing & compacting very deep objects
• deps: send@0.16.0
  • Add 70 new types for file extensions
  • Add immutable option
  • Fix missing </html> in default error & redirects
  • Set charset as "UTF-8" for .js and .json
  • Use instance methods on steam to check for listeners
  • deps: mime@1.4.1
  • perf: improve path validation speed
• deps: serve-static@1.13.0
  • Add 70 new types for file extensions
  • Add immutable option
  • Set charset as "UTF-8" for .js and .json
  • deps: send@0.16.0
• deps: setprototypeof@1.1.0
• deps: utils-merge@1.0.1
• deps: vary@~1.1.2
  • perf: improve header token parsing speed
• perf: re-use options object when generating ETags
• perf: remove dead .charset set in res.jsonp

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