Release v0.4.0

• made scenarios and cases in HTML reports collapsible (Issue-#18)
• slightly changed layout and appearance of HTML reports
• measure duration of each step and include in reports (Issue-#13)
• scenarios are sorted by name in HTML reports
• fix issue with intercepting methods of stages during construction
• fix issue when multiple exceptions are thrown to throw the first one instead of the last one
• @ScenarioDescription is now deprecated, instead just use @Description (Issue-#16)
• @Description now also works on test classes
• fixed case generation for parameterized JUnit runner (Issue-#21)