Arguments

This adds support for configuring the generated bot with arguments instead of prompting for them:

```
yo hubot --adapter=campfire --owner="josh nichols <josh@technicalpickles.com>" --name=testbot --description="such bot"
```

This does still prompt you for what to do about conflicts and stuff if you are running on-top of an existing bot. That can be worked around by passing in `--force`

cc https://github.com/github/generator-hubot/issues/12 https://github.com/github/hubot/issues/605 https://github.com/github/hubot/issues/822