Fix responsive cols + layout change (#284)
Fix responsive cols + layout change (#284)

* remove unknown verticalLayout prop

* conditionally preserve current layout

nd0ut/react-grid-layout,seanich/react-grid-layout,seanich/react-grid-layout,cp/react-grid-layout,STRML/react-grid-layout,vpezeshkian/react-grid-layout,cferrios/react-grid-layout,cferrios/react-grid-layout,cferrios/react-grid-layout,vpezeshkian/react-grid-layout,nd0ut/react-grid-layout,STRML/react-grid-layout,cp/react-grid-layout,vpezeshkian/react-grid-layout,cp/react-grid-layout,seanich/react-grid-layout,nd0ut/react-grid-layout,STRML/react-grid-layout