Update to include use case of WP-API-MENUS items (#1620)
Update to include use case of WP-API-MENUS items (#1620)

https://github.com/gatsbyjs/gatsby/issues/1612
mingaldrichgan/gatsby,ChristopherBiscardi/gatsby,danielfarrell/gatsby,gatsbyjs/gatsby,fk/gatsby,Khaledgarbaya/gatsby,Khaledgarbaya/gatsby,danielfarrell/gatsby,fk/gatsby,0x80/gatsby,fk/gatsby,mickeyreiss/gatsby,0x80/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,mickeyreiss/gatsby,chiedo/gatsby,Khaledgarbaya/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,mickeyreiss/gatsby,mingaldrichgan/gatsby,gatsbyjs/gatsby,danielfarrell/gatsby,ChristopherBiscardi/gatsby,fabrictech/gatsby,ChristopherBiscardi/gatsby,fabrictech/gatsby,chiedo/gatsby,chiedo/gatsby,mingaldrichgan/gatsby,0x80/gatsby,gatsbyjs/gatsby,fabrictech/gatsby