albumArtistSort property added to Album class.
Additional Google Music services added to respective enumeration
GetTrackCount implemented in API
GetHashCode implemented in track and playlist classes
Album and Albumartist classes derived from Playlist.
Albumlist and Albumartistlist classes remodeled using LINQ
LINQ expression corrected in Albumlist class such that identical album titles from different artists are grouped individually
Disc number considered in CompareByAlbum
Google Music models updated
GetStatus method implemented
Method GetSettings added. Several GoogleMusic Service methods updated
Readme and version info updated