Merge pull request #115 from mdwoolley/master

New sample app which illustrates the use of port directed SMS
Fixed incorrect freeing of memory
Merge pull request #116 from jcmurray/master

Fixed incorrect freeing of memory in NfcTool
Merge pull request #117 from mdwoolley/master

Modified messageUpdated to log Attachment.data() message payload to allo...
Worked around known issue in early 10.2 OS builds whereby event_data can
be null as opposed to a pointer to a null string. This is expected to
change so the workaround is temporary. Also know ignoring false errno 16
gatt connect failures.