Initialize the structure of Ember.js style app.
Lack of ember-data.js

I give up finding a usable `ember-data.js',
so this branch will not continue.

I use the `DS' object in Ember.js,
but it is in ember-data project and the project isn't
merged into Ember.js project.
When I redirect to ember-data's github, it didn't provide a usable .js
file. Even the master branch shows a build-failing status from
travis-ci.

Then I turn to Google, but seems there is no answers too.
So I give up.