Add track fields

Tracks need a playcount and a score in addition to all other fields.

libsaria/collection/track.py

@@ -5,6 +5,8 @@ timedelta = datetime.timedelta
 
 class Track:
 	def __init__(self, tags, audio):
+		self.score   = 0
+		self.count   = 0
 		self.genre   = tags.genre or u"Unknown Genre"
 		self.track   = tags.track
 		self.year    = tags.year