Zeit.nightwatch

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- Record skipped tests as passed to prometheus, not failed

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- Handle same metric name (and testname only as label) correctly

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- Allow to configure the test browsers via a config fixture

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- Add convenience `nightwatch` fixture and toplevel API

- Add first test & fix package setup

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- Include prometheus functionality here, to fix pushgateway bug
and support sending the test name as a label.

- Declare namespace package properly

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- Initial release