Implement wsgi.file_wrapper for static file delivery
Implement wsgi.file_wrapper for static file delivery

This is implemented in Django 1.8+, but backporting this for our use
yields a 20% gain in throughput testing locally, and frees up blocking a
python process for our 2.2MB vendor.js delivery since this work is now
deferred to uWSGI instead of Django.

beeftornado/sentry,mvaled/sentry,alexm92/sentry,jean/sentry,gencer/sentry,fotinakis/sentry,mitsuhiko/sentry,zenefits/sentry,ifduyue/sentry,JackDanger/sentry,mvaled/sentry,zenefits/sentry,BuildingLink/sentry,jean/sentry,JamesMura/sentry,JamesMura/sentry,looker/sentry,mitsuhiko/sentry,JamesMura/sentry,zenefits/sentry,alexm92/sentry,beeftornado/sentry,alexm92/sentry,JackDanger/sentry,ifduyue/sentry,BuildingLink/sentry,gencer/sentry,JackDanger/sentry,looker/sentry,mvaled/sentry,zenefits/sentry,gencer/sentry,jean/sentry,looker/sentry,JamesMura/sentry,looker/sentry,fotinakis/sentry,mvaled/sentry,looker/sentry,fotinakis/sentry,JamesMura/sentry,beeftornado/sentry,zenefits/sentry,ifduyue/sentry,BuildingLink/sentry,jean/sentry,mvaled/sentry,gencer/sentry,BuildingLink/sentry,BuildingLink/sentry,ifduyue/sentry,jean/sentry,mvaled/sentry,ifduyue/sentry,gencer/sentry,fotinakis/sentry