Lastfm (ArtistAlbum): Port to new spice api

@jagtalon what do you recommend we do with this one, have limited data. I wanted to include the playcount and also raise the limit on albums displayed, what are your thoughts on this?
![lastfmaa](https://cloud.githubusercontent.com/assets/1424236/5238872/0d1d0cc8-78ed-11e4-938c-0b15f81bb982.png)