twbs/bootstrap — pull request #13275 by zessx (2014-04-04 09:56:37+00:00)
Title: Fix issue using Collapse without Panel

Overview
---
If you try to use Collapse without Panel, you **must** use the `.panel` class to get it work.

Example
---
```

Item #1

Lorem Ipsum

Item #2

Lorem Ipsum

Item #3

Lorem Ipsum

```

Expected behavior
---
On `Item #2` click, we expect the first block (under `Item #1`) to collapse, and the second one (under `Item #2`) to extend.

Current behavior
---
On `Item #2` click, and the second block (under `Item #2`) extends. The first block (under `Item #1`) doesn't collapse.