twbs/bootstrap — pull request #9819 by mdo (2013-08-19 02:55:20+00:00)
Title: BS3: Refactor panels to require default class

This refactors panels to require a default class for improved flexibility when customizing (and no overriding to start in our own CSS and fewer overrides for themers). No visual differences have been added—the only change is the addition of the new default class in the regular panel:

```html

...

```