Allow specifying content-length for HEAD requests or 304 status codes

[nicmunroe]

No description provided.

[nicmunroe]

@rabeyta some more response sending / RFC conformity stuff you may be interested in.

@sdford this should fix the issue with specifying content-length for HEAD responses.

[codecov-io]

Codecov Report

Merging #103 into master will decrease coverage by 0.25%.
The diff coverage is 78.12%.

@@             Coverage Diff              @@
##             master     #103      +/-   ##
============================================
- Coverage     91.47%   91.21%   -0.26%     
- Complexity     2124     2136      +12     
============================================
  Files           149      149              
  Lines          6137     6173      +36     
  Branches        803      813      +10     
============================================
+ Hits           5614     5631      +17     
- Misses          348      362      +14     
- Partials        175      180       +5

Impacted Files	Coverage Δ	Complexity Δ
...a/com/nike/riposte/server/config/ServerConfig.java	95.91% <ø> (ø)	36 <0> (ø)	⬇️
...poste/server/handler/RequestInfoSetterHandler.java	96.87% <ø> (ø)	15 <0> (ø)	⬇️
...ste/server/handler/RequestStateCleanerHandler.java	100% <ø> (ø)	13 <0> (ø)	⬇️
...server/channelpipeline/HttpChannelInitializer.java	100% <100%> (ø)	30 <0> (ø)	⬇️
...a/com/nike/riposte/server/http/ResponseSender.java	69.26% <76.66%> (-3.93%)	74 <25> (+9)
...r/handler/ProxyRouterEndpointExecutionHandler.java	61.25% <0%> (-2.5%)	27% <0%> (ø)
.../com/nike/riposte/server/logging/AccessLogger.java	96.29% <0%> (+1.48%)	48% <0%> (+1%)	⬆️
...ient/asynchttp/netty/StreamingAsyncHttpClient.java	76.51% <0%> (+1.62%)	49% <0%> (+2%)	⬆️

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