Remove unused variable
Remove too much cleverness
Make SuiteRunner control when examples run

The basic flow is the following:
- NewSuite -> SpecDiscover makes Suites route SpecPresent
- when SpecDiscover is completed, SpecRunner routes SpecPrepare to every
  Suite discover its examples
- when all examples are found the Suite routes a SpecReady
- when all SpecMonitors route SpecReady the Suite begin running examples