Coffee script support is provided by `ember-cli-coffeescript` addon.

This addon provides both blueprints and preprocessor support via a
single `npm install --save-dev ember-cli-coffeescript` command.

https://github.com/kimroen/ember-cli-coffeescript
Fix `app.import`'s behavior in addons.

Also, allow `app.import` to specify the `destDir` for non-js/css assets.
Fix smoke test.
Merge pull request #1293 from rjackson/finish-1159

Fix up tests for #1159.
Merge pull request #1289 from rjackson/remove-coffeescript

Coffee script support is provided by `ember-cli-coffeescript` addon.
move QUnit assets into test-vendor.js and test-vendor.css. Add type option to import to specify which that it's a test asset
remove deprecation warning
use _processedVendorTree() instead of hardcoded 'vendor'
add change log entry. Use populateLegacyFiles to populate test files