Merge pull request #5 from KrisKennaway/master

Fix rewind() with bit_count > 1

wozardry.py

@@ -182,8 +182,8 @@ class Track(RawTrack):
             n += b << bit_index
         yield n
 
-    def rewind(self, bit_count):
-        self.bit_index -= 1
+    def rewind(self, bit_count=1):
+        self.bit_index -= bit_count
         if self.bit_index < 0:
             self.bit_index = self.bit_count - 1
             self.revolutions -= 1