thread working with sonar and demo

Dependencies:   C12832 PixelArray RangeFinder WS2812 mbed-rtos mbed

Revision:
0:fb0c24069b95
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PixelArray.lib	Mon Apr 27 12:13:07 2015 +0000
@@ -0,0 +1,1 @@
+http://developer.mbed.org/users/chris/code/PixelArray/#b45a70faaa83