Takes one level of indent off of source.

[kevincox]

When using markdown with marked the following field:

```js
function Mob(name, health) {
    this.name   = name;
    this._health = health || 100;
}
```

Turns into:

function Mob(name, health) {
this.name   = name;
this._health = health || 100;
}

Notice that one level of indentation has been stripped. This does not occur with HighlightJS.