Add travis configuration

.travis.yml

@@ -0,0 +1,14 @@
+# travis file
+# https://docs.travis-ci.com/user/customizing-the-build
+
+language: node_js
+
+node_js:
+  - 7.5.0
+
+before_script:
+  - npm run build
+
+cache:
+  directories:
+    - node_modules