Solution to Task 6.1.7 Note the order in which the locks are taken. Updated for mbed os 5.4

Fork of Task617Solution-mbedos54 by Stage-1 Students SoCEM

Revision:
0:f916cefba2f4
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Mar 08 11:43:39 2016 +0000
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+http://mbed.org/users/mbed_official/code/mbed/builds/252557024ec3
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