added method to chain input filters

Needed a clean way to chain input filters together 
Logically no, I will move it into the Base later today

In library/Zend/InputFilter/InputFilter.php:

> @@ -62,4 +62,17 @@ public function add($input, $name = null)
>          }
>          return parent::add($input, $name);
>      }
> +
> +    /**
> +     * Chain one InputFilter into the current one
> +     * @param BaseInputFilter $inputFilter
> +     * @return $this
> +     */
> +    public function chainInputFilter(BaseInputFilter $inputFilter)

Btw, is there any reason why this method is not on BaseInputFilter?

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