Provide test command for generated projects

[rodyhaddad]

We should overwrite ember-cli's test command, as it uses testem and is setup to test ember-cli applications.

We'd want to it to fire-up karma instead.

We'll need to figure out the story for karma pre-processors, combined with the broccoli build pipelines, as we need to account for addons in projects.

Related #10

[filipesilva]

@Brocco has been working on this in #86

[Brocco]

Closing as it is being tracked via #86

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