[TASK] Configure Travis for better build performance

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

.travis.yml

@@ -1,3 +1,12 @@
+# Enables Travis to use their new container-based infrastructure
+sudo: false
+
+# Build for Ruby
+language: ruby
+
+# Enables caching for bundler
+cache: bundler
+
 # Passes arguments to bundle install (http://gembundler.com/man/bundle-install.1.html)
 # bundler_args: