Build out sendfile usage for protected media serving

[justinrporter]

No description provided.

[codecov-io]

Codecov Report

Merging #182 into master will decrease coverage by 0.37%.
The diff coverage is 21.95%.

@@            Coverage Diff            @@
##           master    #182      +/-   ##
=========================================
- Coverage   94.58%   94.2%   -0.38%     
=========================================
  Files          81      83       +2     
  Lines        4226    4248      +22     
=========================================
+ Hits         3997    4002       +5     
- Misses        229     246      +17

Impacted Files	Coverage Δ
osler/base_settings.py	100% <ø> (ø)	⬆️
osler/wsgi.py	0% <ø> (ø)	⬆️
osler/deploy_settings.py	0% <0%> (ø)	⬆️
osler/production_base.py	0% <0%> (ø)
osler/umkc_production.py	0% <0%> (ø)
osler/debug_settings.py	100% <100%> (ø)	⬆️
osler/urls.py	70.58% <66.66%> (-7.19%)	⬇️

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