function isUndefinedOrNull( value ) {
	return ( value === void 0 || value === null );
}
Tests if a value is `undefined` or `null`.

## Notes

-   In older browsers, `undefined` is a global which can be overridden. `void`, however, is an operator which **cannot** be overridden. Consequently, better to use `void` to check for `undefined`. See [Stack Overflow][1].

[1]: http://stackoverflow.com/a/19369078/2225624

@param {*} value - value to test
@returns {boolean} boolean indicating whether value is undefined

@example
var bool = isUndefinedOrNull( undefined );
// returns true

bool = isUndefinedOrNull( null );
// returns true

bool = isUndefinedOrNull( false );
// returns false