This is mandatory

Dependencies:   BLE_API mbed nRF51822 SHT21_ncleee

Revision:
0:7f951f57dbd2
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nRF51822.lib	Mon Nov 09 18:57:46 2015 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/teams/Nordic-Semiconductor/code/nRF51822/#bf85bf7e73d5