Http request / resonse max size parameter

[ghost]

Some of our services produce rather big responses, bigger than the default of 5 megabytes. So I added two additional settings which are used in the serviceFactory to create the http clients.

[codecov-io]

Codecov Report

Merging #73 into master will increase coverage by 0.23%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
+ Coverage   35.04%   35.27%   +0.23%     
==========================================
  Files          29       29              
  Lines         799      805       +6     
  Branches       34       34              
==========================================
+ Hits          280      284       +4     
- Misses        519      521       +2

Impacted Files	Coverage Δ
.../com/twitter/diffy/proxy/HttpDifferenceProxy.scala	46.15% <0%> (-3.85%)	⬇️
...n/scala/com/twitter/diffy/DiffyServiceModule.scala	100% <100%> (ø)	⬆️

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[puneetkhanduri]

These requirements are independent of SSL and are generally useful. Please use these settings in a shared trait between Http and Https. Bonus points for adding this support at a lower finagle layer so that it may be directly configured in DifferenceProxy to support Thirft in addition to http and https.

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