CommonJS Require example; path vs module

In Node/CommonJS when you `require('lib/math')` you are requiring `math.js` from a module named `lib`. This can be a point of confusion for newbies since it seems like you are requiring from a local path.

``` js
var math = require('lib/math');
console.log('2π = ' + math.sum(math.pi, math.pi));
```

The above might be clearer if it used either of these require paths:

``` js
require('./lib/math.js') // local path
require('lodash/array/chunk.js') // node_modules path
```