angular/angular.js — pull request #2749 by mick8569 (2013-05-22 20:31:10+00:00)
Title: feat(ngToggle): add directive to show and hide two DOM elements

This directive provide a complement for ng-show and ng-hide directives
and change the visibility of two DOM elements depending on an expression.
ngToggle is a frequently used operation and can be implemented like the
following example:

Example:

If exp is evaluated to true then only #A is set to visible, otherwise
only #B is set to visible.

Closes [#228](https://github.com/angular/angular.js/issues/228)