Add travis.yml

From #312

.travis.yml

@@ -0,0 +1,22 @@
+sudo: required
+services:
+  - docker
+
+env:
+    global:
+        - DOCKER_VERSION=1.10.1-0~trusty
+
+before_install:
+  # list docker-engine versions
+  - apt-cache madison docker-engine
+  # upgrade docker-engine to specific version
+  - sudo apt-get -o Dpkg::Options::="--force-confnew" install -y docker-engine=${DOCKER_VERSION}
+  - docker version
+  - docker info
+  - sudo add-apt-repository ppa:duggan/bats --yes
+  - sudo apt-get update -qq
+  - sudo apt-get install -qq bats
+  - make update-dependencies
+
+script:
+  - make test