Support bytes for the application/json binary type

[joguSD]

Continuation of #986

This has been rebased and squashed against the latest master.

[codecov-io]

Codecov Report

Merging #1013 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1013   +/-   ##
=======================================
  Coverage   95.47%   95.47%           
=======================================
  Files          27       27           
  Lines        4487     4487           
  Branches      563      563           
=======================================
  Hits         4284     4284           
  Misses        131      131           
  Partials       72       72

Impacted Files	Coverage Δ
chalice/app.py	96.76% <100%> (ø)	⬆️

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[dbritto-dev]

Thanks @jamesls and @joguSD for review my PR