imprologic

Some Atom feeds, like the ones on YouTube, have the `thumbnail` image defined inside the `media:group` element, like below: ``` ... Saifedean Ammous: How Bitcoin ENDS Inflation Removed for brevity...

Timezone parsing is not yet implemented in Dart's `DateFormat` class, see https://pub.dev/documentation/intl/latest/intl/DateFormat-class.html (scroll to "_The following characters are reserved and currently are unimplemented_"). This PR tries to fix this issue...

Added link to `JsonFeed parser for Dart`