Install gems before node modules on Travis
Install gems before node modules on Travis

`bundle install` fails all the time on Travis, so there's no point
doing an `npm install` first. Fail fast!

...or find a CI system that works.

tijmenb/spotlight,tijmenb/spotlight,keithiopia/spotlight,tijmenb/spotlight,keithiopia/spotlight,alphagov/spotlight,alphagov/spotlight,keithiopia/spotlight,alphagov/spotlight