///
/// Generates cross-browser-compatible `transition` output for a given element.
///
/// @author drublic
///
/// @link http://caniuse.com/css-transitions caniuse
/// @link http://www.w3.org/TR/css3-transitions spec
///
/// @param {Arglist} $values
///
/// @output
/// ```css
///   -webkit-transition: <values>;
///           transition: <values>;
/// ```
///
/// @example
///   .selector {
///     @include x-transition(background 0.3s ease-in);
///   }
///
@mixin x-transition ($values...) {
	-webkit-transition: $values;
	        transition: $values;
}