Merge branch 'master' into alt_speed_fix

qgcunittest.pro

qgroundcontrol.pri

qgroundcontrol.pro

src/GAudioOutput.cc

src/GAudioOutput.h

src/comm/LinkInterface.h

src/comm/MAVLinkSimulationLink.cc

src/comm/MAVLinkSimulationLink.h

src/comm/OpalLink.cc

src/comm/OpalLink.h

src/comm/SerialLink.cc

src/comm/SerialLink.h

src/comm/TCPLink.cc

src/comm/TCPLink.h

src/comm/UDPLink.cc

src/comm/UDPLink.h

src/comm/XbeeLink.cpp

src/comm/XbeeLink.h

src/qgcunittest/UASUnitTest.cc

src/uas/UAS.cc