Get ready to build examples on Travis CI

Author: Ilya Dmitrichenko

.gitignore

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+examples/*/build-*

.travis.yml

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+language: python
+before_script:
+  - "curl -s http://arduino.googlecode.com/files/arduino-${ARDUINO_IDE_VERSION}-linux64.tgz | sudo tar xz -C /opt"
+  - "git clone -q https://github.com/errordeveloper/hwci-scripts ../hwci-scripts && ../hwci-scripts/bin/setup.sh"
+  - "git clone -q https://github.com/amcewen/HttpClient ../HttpClient"
+script:
+  - "for e in `ls -d examples/*/` \
+    ;do env \
+        USER_LIB_PATH=$PWD/../ \
+        ARDUINO_DIR=/opt/arduino-${ARDUINO_IDE_VERSION} \
+        ../hwci-scripts/bin/arduino_make.sh -C $e -f $PWD/examples/include.mk \
+      && echo pass:$e >> results \
+      || echo fail:$e >> results \
+    ;done"
+  - "cat results"
+  - "cut -d: -f1 results | sort | uniq -c"
+  - "test `grep -c fail results` -eq 0"
+
+env:
+  - ARDUINO_IDE_VERSION='1.0.3'

examples/include.mk

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+BOARD_TAG    = uno
+ARDUINO_PORT = /dev/cu.usb*
+ARDUINO_LIBS = Ethernet Ethernet/utility SPI HttpClient cosm-arduino
+
+include Arduino.mk