Dissolution of marriage — Child custody — Jurisdiction — Trial court correctly determined that it had jurisdiction to make an initial custody determination under section 61.514 based on its findings that Florida was the children’s “home state” when husband initiated custody proceedings and that children’s absence from state was temporary — However, upon learning of temporary child custody order in Massachusetts, trial court erred in finding it unnecessary to contact the Massachusetts court to determine whether Massachusetts would be a more appropriate forum to resolve the custody issues as required by Section 61.517(4) — Remand for trial court to communicate with Massachusetts court in accordance with statute