travis build

different configurations are specified in the configurations directory
 to select one copy it replcing the config.h file (as the travis script does)
 or change the include file directive in crossbow.ino

.travis.yml

@@ -0,0 +1,33 @@
+language: c
+env:
+  matrix:
+      - BOARD="adafruit:samd:adafruit_feather_m0" CONFIG="tx_sbus"
+      - BOARD="adafruit:samd:adafruit_feather_m0" CONFIG="rx"
+      - BOARD="adafruit:avr:feather32u4"          CONFIG="tx_sbus"
+      - BOARD="adafruit:avr:feather32u4"          CONFIG="rx"
+before_install:
+  - "/sbin/start-stop-daemon --start --quiet --pidfile /tmp/custom_xvfb_1.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :1 -ac -screen 0 1280x1024x16"
+  - sleep 3
+  - export DISPLAY=:1.0
+  - wget http://downloads.arduino.cc/arduino-1.8.5-linux64.tar.xz
+  - tar xf arduino-1.8.5-linux64.tar.xz
+  - sudo mv arduino-1.8.5 /usr/local/share/arduino
+  - sudo ln -s /usr/local/share/arduino/arduino /usr/local/bin/arduino
+  - arduino --pref "boardsmanager.additional.urls=https://adafruit.github.io/arduino-board-index/package_adafruit_index.json" --save-prefs
+  - if [[ "$BOARD" =~ "adafruit:avr:" ]]; then
+      arduino --install-boards adafruit:avr   > /tmp/install_boards.log || cat /tmp/install_boards.log ;
+    fi
+  - if [[ "$BOARD" =~ "adafruit:samd:" ]]; then
+      arduino --install-boards arduino:samd   > /tmp/install_boards.log || cat /tmp/install_boards.log ;
+      arduino --install-boards adafruit:samd  > /tmp/install_boards.log || cat /tmp/install_boards.log ;
+    fi
+  - arduino --pref "boardsmanager.additional.urls=" --save-prefs
+install:
+  - arduino --install-library "Adafruit SSD1306","Adafruit GFX Library"
+script:
+  - cp -f $PWD/crossbow/configurations/config_${CONFIG}.h $PWD/crossbow/config.h &&
+    arduino --verify --board $BOARD $PWD/crossbow/crossbow.ino
+notifications:
+  email:
+    on_success: change
+    on_failure: change