Mutiple forms on Form wizard

Wraps many Form subclases in order to get a form wizard to treat them as one. Many Forms will use one step. **Example:** `class LanguageVerifiedHumanForm(MultipleForms): base_forms = [ ('language_form', LanguageForm), ('verified_human_form', VerifiedHumanForm) ]` `class NewGuideWizard(SessionWizardView): form_list = [ ('guide_form', GuideForm), ('multi_form', LanguageVerifiedHumanForm), ]`