mbed OS-5 I2C Slave using Nucleo-F401RE board.

Revision:
0:96840f1cc413
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Mon Aug 22 01:30:24 2016 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#d2202045ac8f2fc63836a5b7131c9b56ac58f06a