Raven

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* The threaded worker will now correctly handle forking.
* The 'environment' parameter is now supported (requires a Sentry 8.0 server ).
* 'tags' can now be specified as part of a LoggingHandler's constructor.

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* Added support for detecting `release` on Heroku.
* pkg_resources is now prioritized for default version detection.
* Updated `in_app` support to include exception frames.
* Fixed support for `SENTRY_USER_ATTRS` in Flask.
* Handle DSNs which are sent as unicode values in Python 2.

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* Handle passing ``fingerprint`` through logging handler.

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* Correctly handle SHAs in .git/HEAD.
* Fixed several cases of invalid Python3 syntax.

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* Reverted changes to Celery which incorrectly caused some configurations
to log unwanted messages.
* Improved behavior in ``fetch_git_sha``.
* Removed ``is_authenticated`` property from most integrations.
* Better error handling for errors within Flask context.
* Support for new versions of Flask-Login.
* Update Tornado support for modern versions.
* Update stacktrace truncation code to match current versions of Sentry server.

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* Content is no longer base64-encoded.
* ``fingerprint`` is now correctly supported.
* Django: 1.9 compatibility.
* Celery: Filter ``celery.redirect`` logger.