Extension Builder

I find setter chaining something handy and convenient. Since the generated setters have no return value, it would be easy to add one. The patch below adds a return $this; line to every setter and the right doc block comments.

It simply changes eg.:

    /**
     * Setter for somevalue 
     *
     * @param string $somevalue somevalue 
     * @return void
     */
    public function setSomevalue($somevalue) {
        $this->somevalue = $somevalue;
    }

to

    /**
     * Setter for somevalue 
     *
     * @param string $somevalue somevalue 
     * @return Tx_Someext_Domain_Model_Somemodel
     */
    public function setSomevalue($somevalue) {
        $this->somevalue = $somevalue;
        return $this;
    }