Use latest node on travis beta. Install chrome.

.travis.yml

@@ -1,10 +1,24 @@
+sudo: required
+dist: trusty
 language: node_js
 node_js:
-  - "4"
   - "node"
+addons:
+  # From some tests it seems you can only have one firefox addon.
+  # Adding two results in the last one defined being the one installed.
+  firefox: latest
+  apt:
+    sources:
+      - google-chrome
+    packages:
+      - google-chrome-stable
+before_install:
+  - sudo apt-get update -qq
 before_script:
+  - "export DISPLAY=:99.0"
+  - "sh -e /etc/init.d/xvfb start"
   - npm install -g web-component-tester
   - npm install -g bower
   - bower install
 script:
-  - wct -l chrome .
+  - wct --skip-plugin sauce --plugin local -l chrome