Fix blowing up in playlist hash type.
Hack to stop UrlHashHandlers eating each other's @@types.
Bump version.
Merge branch 'release/v0.4.1' into develop
Fix some bugs with UrlHashHandler.

Also update bra in Gemfile.lock, by accident.
Add text handler, rearrange item adders.
Text takes two arguments, not one.
Add playlist API export for text.
Merge branch 'feature/text-items' into develop
Allow access to a handler's caller's parent.
Add shorthand for NotSupportedByX exceptions
Fix direct loading.
Implement deletion of playlist items.
Move item handler to playlist.
Merge branch 'feature/delete-playlist-items' into develop
Add basic DSL sugar for creating request handlers.
Use new DSL in Playlist.
Add on_delete sugar for delete.
Use in playlist.
Move HandlerBundle to new file and extend.