Ruffruffs

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- Attempt to use the OS's certificate bundle if ``certifi`` isn't available.
- Infinite digest auth redirect fix.
- Multi-part file upload improvements.
- Fix decoding of invalid %encodings in URLs.
- If there is no content in a response don't throw an error the second time that content is attempted to be read.
- Upload data on redirects.

+++++++++++++++++++

* POST redirects now break RFC to do what browsers do: Follow up with a GET.
* New ``strict_mode`` configuration to disable new redirect behavior.

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* Private SSL Certificate support
* Remove select.poll from Gevent monkeypatching
* Remove redundant generator for chunked transfer encoding
* Fix: Response.ok raises Timeout Exception in safe_mode

+++++++++++++++++++

* Generate chunked ValueError fix
* Proxy configuration by environment variables
* Simplification of iter_lines.
* New `trust_env` configuration for disabling system/environment hints.
* Suppress cookie errors.

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* `encode_uri` = False

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* Allow '=' in cookies.