Update to Ember-CLI 0.1.4.

I thought I'd update to Ember-CLI 0.1.4 but as far as I can see there's no real benefit. I guess I'm more just playing around. Free free to not include this update if you don't think it's a good idea.

Note: I didn't include ember-cli-dependency-checker in `package.json` because I hit this issue with sinon:

https://github.com/quaertym/ember-cli-dependency-checker/issues/13