Insurance — Homeowners — Coverage — Exclusions — Proper damage caused by insects or vermin — District court did not err in dismissing complaint for breach of contract and bad faith refusal to pay based on insurer’s denial of coverage for an infestation of brown recluse spiders in insureds’ home because brown recluse spiders are both “insects” and vermin” under ordinary meaning of those terms — District court committed no error by consulting dictionaries to determine those legislative facts