test(): add travis config

Author: michael-ciniawsky

.travis.yml

@@ -0,0 +1,14 @@
+sudo: true
+language: node_js
+node_js:
+  - v6
+  - v4
+cache:
+  directories:
+    - node_modules
+before_script:
+  - npm i
+script:
+  - npm test
+after_success:
+- './node_modules/.bin/nyc report --reporter=text-lcov | ./node_modules/.bin/coveralls'