Behaviour of `let` and `with` is incorrect within a Gherkin `Scenario` and `ScenarioOutline`

[ashleyfrieze]

It appears that let is running for each sub-step, which is not as intended.

I'll rush out a fix when I can find one.

[ashleyfrieze]

ashleyfrieze@154695e <- failing tests inserted to demonstrate the issue.

[ashleyfrieze]

There are three issues:

1. The code for propagating hooks allowed atomic hooks to drop down through a Suite that was itself atomic. You would not expect let to get a fresh answer for each sub-step of a Scenario but you were.
2. The scenarioOutline was just using describe to create each instance of the Scenario for each example, making it NOT create a composite test, making the above not work, even if it had been working
3. The application of blockConfiguration was only implemented for describe not for scenario - root cause was some code duplication with the correct answer only in one place.

@greghaskins - I'd like to consider a patch release, which is why I've made the changes on a branch off our last release. We may not be ready for releasing master yet, as I think some more work on timeout would be a good idea. I think we SHOULD release these fixes after you've reviewed them.

[ashleyfrieze]

Fixes and tests that illustrate the issues on #127