Added arpeggios and cyclic zip operation

examples/music21/music21_example_2.py

@@ -0,0 +1,9 @@
+from music21 import *
+from sardine import *
+from ziffers import *
+
+parsed = zparse('1 2 qr e 124')
+s2 = to_music21(parsed,time="4/4")
+
+s2.show()
+s2.show('midi')