[TASK] Configure Travis for better build performance
[TASK] Configure Travis for better build performance

* set sudo: false so Travis can use their new container-based infrastructure
* enable bundler caching
* set language: ruby for good measure

nazar-pc/haml,tangposmarvin/haml,haml/haml,sideci-sample/sideci-sample-haml,macressler/haml,dg1dd1ngs/haml,stanhu/haml,nazar-pc/haml,keithpitty/haml,haml/haml,macressler/haml,stanhu/haml,keithpitty/haml,dg1dd1ngs/haml,haml/haml,haml/haml,tangposmarvin/haml