Add all command line options for ember test, serve, and generate

[arafatiqbal]

#251

Would love to get feedback on this. I'm not in love with this approach, but I can see how it could be helpful for people to see all command line options for ember test, serve, and generate

Please feel free to drop feedback, I'm open to other suggestions on how to do this.

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[MinThaMie]

Looks good to me :) I've also asked somebody from the CLI core team to take a look!

[bertdeblock]

We already list the output of these commands on https://cli.emberjs.com/release/advanced-use/cli-commands-reference/.
Reading #251, I also think it would be better to list them in the .ember-cli file as an example. Though, the available options are not only limited to the ember generate, ember serve and ember test commands. I think it applies to all commands.