Merge remote-tracking branch 'mavlink/master' into toolbarWork

* mavlink/master: (30 commits)
  android lower minSdkVersion to 16
  Update README.md
  Fix G constant, emit updates more regularly
  QGC: Fix excessive noise terms
  check for new and old flightgear path
  set correct path to flightgear executable on osx
  fix android auto versionName update
  travis-ci try installing PyOpenSSL with pip
  travis-ci add python-openssl for google play publish
  travis-ci run doxygen config last
  travis-ci pip install --user
  travis-ci install google-api-python-client
  fix travis decrypt google play credentials
  android auto version and deploy to google play
  update android version
  Remove Flightgear and JSBSim and only leave the option which actually works.
  Wait after window close to prevent qml warnings
  Restructure to prevent shutdown warnings
  QT_FATAL_WARNINGS back on
  Remove remaining singletons
  ...

Conflicts:
	src/FirmwarePlugin/PX4/PX4FirmwarePlugin.cc