added CORS complient preflight headers
added CORS complient preflight headers

emoncms/emoncms,inverse/emoncms,chaveiro/emoncms,emoncms/emoncms,chaveiro/emoncms,inverse/emoncms,emoncms/emoncms,emoncms/emoncms,chaveiro/emoncms,chaveiro/emoncms,emoncms/emoncms,inverse/emoncms,inverse/emoncms