Fix the elapsed test and #1133
Thanks to @maxcountryman for the code review
Merge pull request #1151 from sigmavirus24/fix1133

Move redirect handling from Session.request to Session.send
Add Proxy-Auth header when proxies have credentials.
Feature freeze.
Merge pull request #1168 from Lukasa/freeze

Feature freeze.
Merge pull request #1162 from Lukasa/proxy_auth

Proxy Authorization Headers