New feature: Switch.

Switches can be used instead of regular radio buttons, to switch between two or more options. They are very customizable and use styles from other components such as buttons or panels.

The switches are CSS-only, and only show-up on modern browsers. Browsers without support for media queries get standard form elements.
Merge remote-tracking branch 'ghinda/switch' into ghinda-pr2
added #1414, which adds switches to Foundation 4