travis-ci create Linux AppImage

-closes mavlink#2913

.travis.yml

@@ -188,6 +188,10 @@ script:
     fi
 
 after_success:
+  - if [[ "${TRAVIS_OS_NAME}" = "linux" && "${CONFIG}" = "installer" ]]; then
+        ${TRAVIS_BUILD_DIR}/deploy/create_linux_appimage.sh
+        ;
+    fi
   - if [ "${TRAVIS_TAG}" ]; then
         export GOOGLE_PLAY_TRACK=production;
     else

deploy/create_linux_appimage.sh

@@ -0,0 +1,54 @@
+#!/bin/bash -x
+
+set +e
+
+# Generate AppImage using the binaries currently provided by the project.
+# These require at least GLIBC 2.14, which older distributions might not have. 
+# On the other hand, 2.14 is not that recent so maybe we can just live with it.
+
+APP=qgroundcontrol
+
+mkdir -p /tmp/$APP/$APP.AppDir
+cd /tmp/$APP/
+tar xf ${SHADOW_BUILD_DIR}/release/package/qgroundcontrol.tar.bz2
+
+wget -c http://ftp.us.debian.org/debian/pool/main/u/udev/udev_175-7.2_amd64.deb
+wget -c http://ftp.us.debian.org/debian/pool/main/e/espeak/espeak_1.46.02-2_amd64.deb
+wget -c http://ftp.us.debian.org/debian/pool/main/libs/libsdl1.2/libsdl1.2debian_1.2.15-5_amd64.deb
+
+cd $APP.AppDir/
+
+mv ../qgroundcontrol/* .
+mv qgroundcontrol-start.sh AppRun
+find ../ -name *.deb -exec dpkg -x {} . \;
+
+# Get icon
+cp ${TRAVIS_BUILD_DIR}/resources/icons/qgroundcontrol.png .
+
+cat > ./qgroundcontrol.desktop <<\EOF
+[Desktop Entry]
+Type=Application
+Name=QGroundControl
+GenericName=Ground Control Station
+Comment=UAS ground control station
+Icon=qgroundcontrol
+Exec=AppRun
+Terminal=false
+Categories=Utility;
+Keywords=computer;
+EOF
+
+VERSION=$(strings qgroundcontrol | grep v[0-9*]\.[0-9*]\.[0-9*]-[0-9*] | head -n 1)
+
+# Go out of AppImage
+cd ..
+
+wget -c "https://github.com/probonopd/AppImageKit/releases/download/5/AppImageAssistant" # (64-bit)
+chmod a+x ./AppImageAssistant
+mkdir -p ../out
+rm ../out/$APP".AppImage" || true
+./AppImageAssistant ./$APP.AppDir/ ../out/$APP".AppImage"
+
+# s3 deploys everything in release/package
+cp ../out/$APP".AppImage" ${SHADOW_BUILD_DIR}/release/package/$APP".AppImage"
+