Repeatables without labels

Closes #43
This is tangential to this PR, but is this behavior really logical for these values? To me, it seems like `starting_count` should be used until `count( $values )` is >=, and only then would extra_elements be used.

EG, with `limit = 0, starting_count = 4, extra_elements = 1` I'd want to see 4 fields (1 filled + 3 empty, 2 filled + 2 empty...) until there are 4+ values, and then I'd always want one blank. Right now, I think as soon as you filled one value you'd only see 2 fields.