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

Dependencies:   DigitDisplay mbed

History

initial commit - looks good and supports 0-9, a-b, hyphen, and underscore default tip

2014-09-07, by mfiore [Sun, 07 Sep 2014 05:30:25 +0000] rev 0

initial commit - looks good and supports 0-9, a-b, hyphen, and underscore