Project Features

We've talked a bit about having features when creating a project. I'd like to continue that discussion here, while also adding in this thought: the features should be built in such a way that they could be added (and perhaps removed) later.

So from a project root, something like this:

```bash
$ unthink feature
```

And get a list of features to add.

I think one way of accomplishing the features would be via a simple JSON config that has what needs to be added to the package.json as well as what templates/files need to be copied.