become ember addon to get default blueprint

[kellyselden]

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If we tagged this as an ember addon, we could run a default blueprint and do the following things:

• add a node tests job to travis like https://github.com/ember-cli/ember-cli-blueprint-test-helpers/pull/130
• add the /test folder to npmignore like https://github.com/ember-cli/ember-cli-blueprint-test-helpers/pull/129

Blocked on https://github.com/ember-cli/ember-cli/pull/7384