Add support for content:encoded support for Podcast

[rock3r]

We are modeling the content:encoded for the <item> nodes, but not for the <channel> nodes. That's not great, because many podcasts use it (e.g., src/test/resources/xml/real-life-feeds/reply-all.xml). We should add a PodcastContent.

[rock3r]

I have done this but it is a breaking change both in terms of source and binary compatibility. I can create a 2.0.0 branch once #95 is merged, and we can consider shipping 1.1.0 since it has a meaty set of changes as it is already. What do you think @mpgirro?

[mpgirro]

I'm fine with shipping 1.1.0. I've got about half of #76 done, but won't be able to finish it in the near future. Just something for 1.2.0 then :)

[rock3r]

Makes sense. I'll tag and release 1.1.0, and create 1.2.0 and 2.0.0 milestones.

[mpgirro]

👍

[rock3r]

I've discovered a pretty severe bug with the List<...>.asBuilders() implementations, I'm working on a fix and will release 1.1 after that's shipped.