build(ci): Re-enable TravisCI (take 3).

Author: chriseppstein

.travis.yml

@@ -13,4 +13,5 @@ before_install:
   - npm install -g lerna yarn
   - ./scripts/checkout-opticss.sh build/opticss
   - ./scripts/link-to-opticss.js --hard build/opticss
+
 install: lerna bootstrap --registry=https://registry.npmjs.org/