Implemented basic FLAC support (no artwork, yet!)

util.go

@@ -5,6 +5,7 @@
 package tag
 
 import (
+	"encoding/binary"
 	"io"
 )
 
@@ -63,3 +64,9 @@ func read7BitChunkedInt(r io.Reader, n int) (int, error) {
 	}
 	return get7BitChunkedInt(b), nil
 }
+
+func readInt32LittleEndian(r io.Reader) (int, error) {
+	var n int32
+	err := binary.Read(r, binary.LittleEndian, &n)
+	return int(n), err
+}