Behave

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* Fixes for JSON output.
* Move summary reporter and snippet output to stderr.

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* Changed step name provided in snippets to avoid issues with the step
decorator.
* Use setup to create console scripts.
* Fixed installation on Windows.
* Fix ANSI escape sequences for cursor movement and text colourisation.
* Fixes for various command-line argument issues.
* Only print snippets once per unique step.
* Reworked logging capture.
* Fixes for dry-run mode.
* General fixes.

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* Context variable now contains current configuration.
* Context values can now be tested for (``name in context``) and deleted.
* ``__file__`` now available inside step definition files.
* Fixes for various formatting issues.
* Add support for configuration files.
* Add finer-grained controls for various things like log capture, coloured
output, etc.
* Fixes for tag handling.
* Various documentation enhancements, including an example of full-stack
testing with Django thanks to David Eyk.
* Split reports into a set of modules, add junit output.
* Added work-in-progress ("wip") mode which is useful when developing new code
or new tests. See documentation for more details.

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* Initial release