Allow travis to use newer-faster infrastructure for building. http://…

…blog.travis-ci.com/2014-12-17-faster-builds-with-container-based-infrastructure/

.travis.yml

@@ -2,6 +2,7 @@
 # RVM/bundler/ruby and whatnot. Right now 'rust' as a language actually
 # downloads a rust/cargo snapshot, which we don't really want for building rust.
 language: c
+sudo: false
 
 # The test suite is in general way too stressful for travis, especially in
 # terms of time limit and reliability. In the past we've tried to scale things