add spec for OptionDefinition with block with arity 2
add spec for OptionDefinition with block with arity 2

mihailim/image_optim,toy/image_optim,ramiroaraujo/image_optim,ramiroaraujo/image_optim,toy/image_optim,ramiroaraujo/image_optim,toy/image_optim,mihailim/image_optim,mihailim/image_optim