add support for itunes:author and itunes:summary
add support for itunes:author and itunes:summary

katrinleinweber/podlove-publisher,podlove/podlove-publisher,podlove/podlove-publisher,podlove/podlove-publisher,podlove/podlove-publisher,katrinleinweber/podlove-publisher,podlove/podlove-publisher,noplanman/podlove-publisher,noplanman/podlove-publisher,katrinleinweber/podlove-publisher,noplanman/podlove-publisher,katrinleinweber/podlove-publisher,noplanman/podlove-publisher,noplanman/podlove-publisher,katrinleinweber/podlove-publisher,podlove/podlove-publisher