feat(router): make server_token configurable

[lachie83]

http://nginx.org/en/docs/http/ngx_http_core_module.html#server_tokens

Syntax: server_tokens on | off | string;
Default: server_tokens on;
Context: http, server, location

[deis-bot]

@krancour, @ultimateboy and @arschles are potential reviewers of this pull request based on my analysis of git blame information. Thanks @lachie83!

[codecov-io]

Current coverage is 55.35% (diff: 100%)

Merging #301 into master will increase coverage by 0.11%

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+ Hits            211        212     +1   
  Misses          151        151          
  Partials         20         20          

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[bacongobbler]

If you wouldn't mind amending your commit such that it follows the commit style guide, that would be awesome! That way it'll get picked up by deisrel when we generate the release changelog. Thanks!

[bacongobbler]

Thanks for doing this, @lachie83.

[lachie83]

@bacongobbler updated commit message