stepIAmNotLoggedIn() would previously just kill the test
session, but this has the side effect of losing the current testsession
temporary database, so this causes steps of logging out to fail the
rest of the steps in a scenario.
See https://github.com/silverstripe-labs/silverstripe-behat-extension/pull/12
- Moved all extension-specific conf into its own configuration namespace
- Described configuration via PHP, and added default values
- Removed boilerplate config from README
- Made screenshot_path optional
- Configurable ajax_timeout settings
Note: The DI system plus the initializer+context combo requires insane amounts of code duplication,
will need to be looked at more closely (very little docs on that level of Behat extension available).