Upgrade to ember-cli 0.1.14

Upgrades to ember-cli 0.1.14 and fix the build at the same time
Let's be vain and cash in on our due credit with a `contributors` key after this:

```json
"contributors": [
  {
    "name": "Justin Bull",
    "email": "jbull@freshbooks.com"
  }, {
    "name": "Alexandre Baizeau",
    "email": "abaizeau@freshbooks.com"
  }
]
```