twbs/bootstrap — pull request #13845 by BBosman (2014-06-17 19:42:30+00:00)
Title: Fix dismissible spelling

Based on #10404.

In the code we use `dismissable`, while it should be `dismissible`. ([Dictionary entry](http://www.oxforddictionaries.com/definition/english/dismiss?q=dismissible#dismiss__15))

I changed all references in the docs, but kept a copy of the old class name in the `alerts.less` file, marked as deprecated, for backwards compatibility.