Add Changes for v0.4.0
Resolve #10: Convert Podcast.Image and Episode.Enclosure to Mopidy model types
Resolve #4: Support for <itunes:image>
Resolve #8: Add uri parameter to search
Resolve #9: Add uri property to Podcast and Episode
Resolve #11: Change data types for pubdate, duration
Resolve #12: Add uri_schemes to PodcastDirectory
Resolve #13: Add search_results config value
Resolve #14: Additional podcast/episode properties
Move RSS parsing to FeedsDirectory
Prepare v1.0.0