First pass at using Travis CI (#4690)

Author: GeoffreyBooth

.travis.yml

@@ -0,0 +1,18 @@
+language: node_js
+
+node_js:
+  - 6
+  - 8
+
+cache:
+  directories:
+    - node_modules
+
+script:
+  - node ./bin/cake build:except-parser
+  - node ./bin/cake build:parser
+  - node ./bin/cake build:full
+  - node ./bin/cake build:browser
+  - node ./bin/cake test
+  - node ./bin/cake test:browser
+  - node ./bin/cake test:integrations