Simple USBSerial test available, _getc test + LED

Dependencies:   USBDevice mbed

Revision:
0:1ec32b38f724
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBDevice.lib	Wed Jun 25 02:25:16 2014 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/USBDevice/#0c6524151939