TravisCI, again

Having a proper look at this; The rust-nightly package is only build for
14.04.  Travis (by default) uses 12.04 (Precise), but has a 14.04 image
which you can opt for.  Hopefully this doesn't break anything else!

Author: JamesFysh

.travis.yml

@@ -1,12 +1,17 @@
-sudo: false
 # Travis only supports one language per project, so we need to put something
 # here. node_js is as good as any other I suppose.
 language: node_js
 node_js:
   - "0.10"
 
+# For rust, we need to install cargo, rustc.  In order to do that, we'll use
+# apt-get, which requires sudo.
 sudo: true
 
+# The rust-nightly package is only built for 14.04 (Trusty) and 16.04 (Xenial),
+# so we cannot use the default Travis ubuntu image (Precise) for these tests.
+dist: trusty
+
 # Install package dependencies. See
 # http://docs.travis-ci.com/user/installing-dependencies/
 # gulp: required for JS testing