Fix #1 add continuous integration testing

.travis.yml

@@ -0,0 +1,30 @@
+language: python
+
+python:
+  - 2.7
+
+sudo: false
+
+cache:
+  directories:
+    - ~/.platformio
+
+# update Makefile if target boards added
+env:
+  - PLATFORMIO_BOARD=uno
+  - PLATFORMIO_BOARD=due
+  - PLATFORMIO_BOARD=huzzah
+  - PLATFORMIO_BOARD=genuino101
+  - PLATFORMIO_BOARD=teensy31
+
+install:
+  - pip install -U platformio
+
+before_script:
+  - env
+  - echo $HOME
+  - echo $TRAVIS_BUILD_DIR
+  - ls -al $PWD
+
+script:
+  - make build

Makefile

@@ -0,0 +1,19 @@
+#-------------------------------------------------------------------- settings
+FIND          := find
+DIR           := $(PWD)/examples
+CRITERIA      := \( -name "*.ino" -o -name "*.pde" \)
+EACH_EXAMPLE  := $(FIND) $(DIR) $(CRITERIA) -exec
+BUILD         := platformio ci
+LIB           := src
+
+#--------------------------------------------------------------------- targets
+# update .travis.yml if target boards added
+all: uno due huzzah genuino101 teensy31
+
+uno due huzzah genuino101 teensy31:
+	PLATFORMIO_BOARD=$@ $(MAKE) build
+
+build:
+	$(EACH_EXAMPLE) $(BUILD) --board=$(PLATFORMIO_BOARD) --lib=$(LIB) {} \;
+
+.PHONY: all uno due huzzah genuino101 teensy31 build