spec auto-multipart for rails 3.1+
spec auto-multipart for rails 3.1+

partheey-vakilsearch/nested_form,jweslley/nested_form,Stellenticket/nested_form,jweslley/nested_form,pinglamb/nested_form,Stellenticket/nested_form,pinglamb/nested_form,tomasdundacek/nested_form,dhunnapotha/nested_form,ryanb/nested_form,partheey-vakilsearch/nested_form,tomasdundacek/nested_form,cuongnguyen2503/nested_form,dhunnapotha/nested_form,jweslley/nested_form,dhunnapotha/nested_form,cuongnguyen2503/nested_form,cuongnguyen2503/nested_form,alphagov/nested_form,alphagov/nested_form,pinglamb/nested_form,Stellenticket/nested_form,ryanb/nested_form,partheey-vakilsearch/nested_form