Consider: "inspects" - step/describe hybrid

[nyarly]

Part of the useful behavior of a steps block is that it pushes all "before" to :all - So for instance, it would be helpful to be able to say:

inspect "A controller" do
  before do
    get :show
  end

  it "should" do
    assigns[:thing].should blah
  end

end

And have the before :each blocks become before :all - pushing all the ControllerTest stuff up, so that we only set up the response once, and can check several things about it in separate tests.