Allow Spec's .pending and .it to accept constant

[straight-shoota]

This enables to use pending and it with a constant as description argument:

pending Foo do
end
it Foo do
end

This already works for describe and context, but for both pending and it raised an error because of mismatching types.

[konovod]

Isn't spec name supposed to be a clear description of what test do?
Maybe I'm missing some cases, but
Char::Reader raises IndexError when smth - nice name for a test
Char::Reader IndexError - not nice.

[straight-shoota]

@konovod Yeah, I'm not sure if it makes much sense for it to use a constant as description. But pending should definitely support it because you can simply convert a describe or context to pending. Given that all the other methods support a constant, it's better to have it on it as well.

[straight-shoota]

Maybe a useful example for it:

describe "#read" do
  it Int { }
  it String { }
end

[Sija]

I wouldn't go for it but pending makes sense.

[jhass]

This doesn't hurt to just allow