Test out DigitalOut on Teensy 3.1

Dependencies:   mbed USBDevice

Revision:
0:8495741fab9c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sat Jul 25 10:29:43 2015 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/bad568076d81
\ No newline at end of file