Start work on upgrading requests.
Calculate & log percentage of GitHub ratelimit

Ref: #580
Added the new packages to vendor.

Let's break some tests! :grin:
Sentry aware logging.
And that should finish the upgrade.
Update requirements.txt

Travis was encountering errors because of the requirements file.
Upgrade balanced vendored package as well.
Wow that's a major D'OH!
Upgrade stripe too
This should fix the first error
Kill all usage of requests-oauth

Let's see if the tests will pass now.
Update to Twitter API v1.1 ratelimit headers
Merge pull request #1 from buttscicles/sigmavirus24-upgrade_requests

Update to Twitter API v1.1 ratelimit headers
Merge pull request #1047 from sigmavirus24/upgrade_requests

[WIP] Upgrade requests