StoryRunner methods should use BehaviourListener instead of OutputStream

StoryRunner methods should not be coupled to OutputStreams. Use BehaviourListener instead.

The methods using OutputStream should be deprecated in favour of BehaviourListener, with PlainTextScenarioListener as the default impl.

Refactor requires two methods to be added to BehaviourListener interface:

void printReport();
boolean hasBehaviourFailures();