Task 6.1.3 Starting point updated for mbed OS 5.4

Revision:
0:1f4d20070876
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Mar 08 11:45:42 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/252557024ec3
\ No newline at end of file