Responses

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- Support for Python 3.7 (196)
- Support streaming responses for BaseResponse (192)
- Support custom patch targets for mock (189)
- Fix unicode support for passthru urls (178)
- Fix support for unicode in domain names and tlds (177)

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- Added the ability to passthru real requests via ``add_passthru()``
and ``passthru_prefixes`` configurations.

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- Responses will now be rotated until the final match is hit, and
then persist using that response (GH-171).

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- Fixed call counting with exceptions (GH-163).
- Fixed behavior with arbitrary status codes (GH-164).
- Fixed handling of multiple responses with the same match (GH-165).
- Fixed default path behavior with ``match_querystring`` (GH-166).

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- Restored ``adding_headers`` compatibility (GH-160).

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- Allow empty list/dict as json object (GH-100).
- Added `response_callback` (GH-151).
- Added ``Response`` interfaces (GH-155).
- Fixed unicode characters in querystring (GH-153).
- Added support for streaming IO buffers (GH-154).
- Added support for empty (unset) Content-Type (GH-139).
- Added reason to mocked responses (GH-132).
- ``yapf`` autoformatting now enforced on codebase.