Remove extra test noise.

`runCommand` already prints the output, there is no reason to log it
again.
Merge pull request #1232 from rjackson/remove-extra-test-noise

Remove extra test noise.
Allow running tests in production.
Merge pull request #1230 from rjackson/use-environment-consistently

Allow testing of production assets.
Provide Ember CLI version to Project model.
Merge pull request #1239 from rjackson/provide-brocfile-with-ember-version

Provide Ember CLI version to Project model.