scroller for 4 digit display, rides on top of DigitDisplay and scrolls messages of arbitrary length

Dependencies:   DigitDisplay mbed

Revision:
0:f8d65945b096
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DigitDisplay.lib	Sun Sep 07 05:30:25 2014 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/seeed/code/DigitDisplay/#d3173c8bfd48