Merge pull request #88 from jcmurray/master

NfcChicken Sample as demonstrated at BBJam Amsterdam
Update bb10-pjsipdemo/src/PjsipEngine.cpp

Add accept incomming call
Update bb10-pjsipdemo/src/PjsipEngine.hpp

Add accept incomming call
Merge pull request #89 from nguyentran/patch-3

Update bb10-pjsipdemo/src/PjsipEngine.cpp
Merge pull request #90 from nguyentran/patch-4

Update bb10-pjsipdemo/src/PjsipEngine.hpp
Add missing files