Use a Travis-Compatible build

@shajith @jish PASSING TRAVIS BUILD!

This project is now set up almost exactly like jamesarosen/ember-i18n.

I could have gotten Jasmine + Rake + PhantomJS working on Travis, but I couldn't figure out a way to have two different builds -- one for Ember 0.9.8.1 and one for Ember 1.0 -- in Jasmine. jamesarosen/ember-i18n does this with Mocha + Make + PhantomJS already, so I decided to copy that build system.