(plaintiff complained that defendant's zoning laws were unconstitutional as applied to their proposed composting facility; court held that there was no equal protection violation when law enforced against plaintiff and not against competing composting facility; other facility in existence before zoning law became effective and was non-conforming use; substantive due process claim also failed because no evidence existed that defendant's request for revisions to plaintiff's site plan were arbitrary and capricious; plaintiff did not have protected property interest in using their land for composting because approval of composting activity was matter within discretion of township's planning commission).