Planterbox

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- Specify scenarios by name in nose2 command-line arguments

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- Compatibility with API changes from nose2 0.6.0

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- Scenario hooks now fire before & after every example in an outline

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- Use utf8 encoding when reading feature files

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- Add after error and after failure hooks
- Pass TestCase instance to step hooks just like all other hooks
- Provide convenience attributes on TestCase:
- scenario_name
- scenario_index (during error, failure, scenario and step hooks)
- step
- step_function (during error, failure, and step hooks)
- exc_info (during error and failure hooks)
- Automatically add test date & time to config (reporting convenience)

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- Add planterbox config section as .config on all FeatureTestCases
- Add planterbox output plugin for summarizing feature results
- Remove test.world support - it was a terrible idea