Build: use docker queue in travis build to improve speed

Closes gh-7638

Author: joshk

.travis.yml

@@ -1,13 +1,20 @@
 language: php
+
 php:
   - "5.5"
+
+sudo: false
+
 before_script: 
   - npm install -g grunt-cli
   - npm install
+
 script: npm run-script ci
+
 branches:
   only:
     - master
+
 env:
   - TYPES=unit
     JQUERIES=1.8.3