Added section about nightly builds
Merge branch 'develop'
Added feed generators, basic rss tests
Disabled downloading of episode images. closes #390

Uses too much bandwidth
Added navigation drawer + new episodes fragment
Added secondary button to new episodes list
Added queue fragment
Added downloads fragment
Added playback history fragment
Sorting via drag and drop was interrupted by download observer
Added fragment for adding new podcasts
Reimplemented ItemlistFragment
Added action button functionality
Added FeedItem dialog
Improved external player layout
Moved RemoveListener into DragSortListener
Re-implemented search
Re-implemented menus
Added navigation drawer to audio player, fixed DownloadService notification
Resolved dialog issues + fragment crashes