I was getting the following error when running `rake commonjs`:

```
rake aborted!
no such file to load -- rspec/core/rake_task

(See full trace by running task with --trace)
```

This was with a default OS X Lion install. The issue was simply that
rspec was not installed, however, it may not be obvious at first.

If a section key returns a function, it will be called
and passed both the unrendered block of text and a renderer
convenience function.

Given this JS:

  "name": "Tater",
  "bolder": function() {
    return function(text, render) {
      return "<b>" + render(text) + '</b>'
    }
  }

And this template:

  {{#bolder}}Hi {{name}}.{{/bolder}}

We'll get this output:

  <b>Hi Tater.</b>

As you can see, we're pre-processing the text in the block.
This can be used to implement caching, filters (like syntax
highlighting), etc.

You can use `this.name` to access the attribute `name` from
your view.