subjectAction should_be even more useful

gistfile1.m

```
describe(@“response to a network request or whatnot”)
	subjectAction(^{ something that triggers the response})

	context(@“When there’s a success of type A”);
	context(@“When there’s a success of type B”);
	context(@“When there’s a success of type C”);
	. . . . 
	context(@“when there is an error”)
		beforeEach(^{
			response = responseThatTriggersError;
		});

		it(“should display an alert”);

		context(“when the user touches ‘ok’”)
			beforeEach({
				[[UIAlertView currentAlertView] dismissWithOKButton];
			});
```