Update to serve as Ember CLI Addon.

- Move example.html and dependencies to subdirectory to clean up the root directory and allow for the use of a vendor/ subdirectory for ember-cli.
- Add Ember CLI addon.
- Add grunt copy task to prepare vendor/ subdirectory for publishing to NPM.
- Change npm package name from `ember-data-parse-adapter` to `ember-parse-adapter`
- Adds ember-addon keyword.

You will need to publish to NPM, and then users can simply run `npm install --save-dev ember-parse-adapter`, and it just works.

Closes #31

See [emberFire #76](https://github.com/firebase/emberFire/pull/76) for the rationale behind the structure.