* 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
* Minor doc and comment corrections
* Fixed bug where it was impossible to make attachments from 'after scenario' hook, also removed some dud comments.
* typo
* support multiple calls to the Attach() function from a single step
* run_progress_test.go changed so it's not sensitive to the name of the clone target directory
* applied code review comments also added _example/attachments
* applied code review comments also added _example/attachments
* applied code review comments also added _example/attachments
* 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)
