Merge pull request #7 from matt-moser/master

Changed stream_mode to default gracefully when setting is invalid
Keep a track of most recently played artists
Radio refactoring and better handling if no artist found
Bug fix for re-attempts when failed to find artist
Default to unsorted ordering on artists in collection page
Artist radio playback bug fix
Update changelog for 1.9.0
Updated for version 1.9.0
Added credit for stream modef fix
Update plugin icon
Add new releases from different timeframes
Added fanart