First cut at building with Travis

.travis.yml

@@ -0,0 +1,15 @@
+sudo: required
+
+before_install:
+  - sudo add-apt-repository -y ppa:team-gcc-arm-embedded/ppa
+  - sudo apt-get update -qq
+  - sudo apt-get install -y build-essential libftdi-dev gcc-arm-embedded
+  - sudo pip install intelhex
+
+install: true
+
+script:
+  - make -C libopencm3 lib
+  - make -C src all_platforms
+
+