Add ember data dependency to the quickstart

[barryofguilder]

This adds the ember-data dependency to the Quickstart docs. It will help address #818.

[RobbieTheWagner]

Thanks for the PR @barryofguilder! I wonder if we should add ember-data in the blueprints so it gets automatically installed? We could also take all the packages the blueprint installs and add them all into one big install command maybe.

[barryofguilder]

Thanks for the PR @barryofguilder! I wonder if we should add ember-data in the blueprints so it gets automatically installed? We could also take all the packages the blueprint installs and add them all into one big install command maybe.

I've added ember-data to the blueprint. I'm not totally sure what you mean by adding them to an install command.

[RobbieTheWagner]

@barryofguilder I just meant moving away from broccoli auto install and instead saying like ember install ember-cli-addon-docs ember-data ember-cli-deploy ember-cli-deploy-git etc etc