twitter/bootstrap — pull request #4995 by theodorton (2012-09-05 16:18:51+00:00)
Title: Adds option for popovers and tooltips so you can easily define a custom class

Examples:
```javascript
$(selector).popover({
'class': 'my-custom-class'
});
```
```coffee
$(selector).popover
class: 'my-custom-class'
```

Should result in:

```html

...

```

May not work if you're also setting the (undocumented) `template`-option, but I'd say it's redundant to assign both.

Tested and documented.