Add rsvp to depencencies

My devDependencies look like this:

```json
"devDependencies": {
    "grunt": "^0.4.5",
    "grunt-contrib-concat": "^0.5.0",
    "grunt-contrib-connect": "^0.8.0",
    "grunt-contrib-jshint": "^0.10.0",
    "grunt-contrib-watch": "^0.6.1",
    "grunt-karma": "^0.8.3",
    "grunt-ng-annotate": "^0.3.2",
    "grunt-phpunit": "^0.3.4",
    "grunt-protractor-runner": "^1.1.4",
    "grunt-protractor-webdriver": "^0.1.8",
    "grunt-traceur": "^0.2.4",
    "grunt-wrap": "^0.3.0",
    "karma": "^0.12.23",
    "karma-chrome-launcher": "^0.1.4",
    "karma-coverage": "^0.2.6",
    "karma-firefox-launcher": "^0.1.3",
    "karma-jasmine": "^0.1.5",
    "karma-phantomjs-launcher": "^0.1.4",
    "karma-traceur-preprocessor": "^0.3.1",
    "traceur": "^0.0.59"
  }
```

Now when i run **npm install** it installs all the deps but when I try to run my grunt traceur task it complains about missing rsvp lib:

    $ grunt
    Loading "traceur.js" tasks...ERROR
    >> Error: Cannot find module 'rsvp'
    Warning: Task "traceur" not found. Use --force to continue.

    Aborted due to warnings.

Running **npm install rsvp** fixes the issue so I think it's correct to put rsvp into the dependencies section