tests working and examples updated

lib/emitter/docs/examples/AssignmentGraded.json

lib/emitter/docs/examples/AssignmentSubmitted.json

lib/emitter/docs/examples/AttemptCompleted.json

lib/emitter/docs/examples/AttemptStarted.json

lib/emitter/docs/examples/Attended.json

lib/emitter/docs/examples/CourseCompleted.json

lib/emitter/docs/examples/CourseViewed.json

lib/emitter/docs/examples/DiscussionViewed.json

lib/emitter/docs/examples/EnrolmentCreated.json

lib/emitter/docs/examples/EventEnrol.json

lib/emitter/docs/examples/EventUnenrol.json

lib/emitter/docs/examples/ModuleViewed.json

lib/emitter/docs/examples/QuestionAnswered.json

lib/emitter/docs/examples/ScormEvent.json

lib/emitter/docs/examples/ScormLaunched.json

lib/emitter/docs/examples/ScormScorerawSubmitted.json

lib/emitter/docs/examples/ScormStatusSubmitted.json

lib/emitter/docs/examples/UserLoggedin.json

lib/emitter/docs/examples/UserLoggedout.json

lib/emitter/docs/examples/UserRegistered.json