* added the missing impl of json/events/junit/pretty - still need 'progress' and 'junit,pretty'
* added tests for "progress formatter"
* switched from tabs to spaces in the ambiguous steps error message
* rename some_scenarions_including_failing
to some_scenarios_including_failing
* changelog
* Pretty Print when using rules (#440)
* Pretty Print when using rules (#440)
* fix a few formatting mistakes (#440)
* added test with rule and scenario outline (#440)
