kennethreitz/requests — pull request #1033 by slingamn (2012-12-18 07:59:10+00:00)
Title: restore old certificate bundle behavior

Since a CA bundle started being vendored inside Requests, it always
overrides the OS bundle. This changes the preference order to be
packaged certifi, then the OS bundle, then the vendored bundle,
allowing managed environments to use their system bundles by simply
omitting a certifi package.

References: #557