function isEven( x ) {
	return isInteger( x/2.0 );
}
Tests if a finite numeric value is an even number.

@param {number} x - value to test
@returns {boolean} boolean indicating whether the value is an even number

@example
var bool = isEven( 5.0 );
// returns false

@example
var bool = isEven( -2.0 );
// returns true

@example
var bool = isEven( 0.0 );
// returns true

@example
var bool = isEven( NaN );
// returns false