Add escapeValue() to the Faster_Data class for escaping SQL strings

[volomike]

The PDO quote() function leaves much to be desired. We're told to use mysql_real_escape_string(), but that requires a connection to the database to be passed to it for some strange reason. By adding escapeValue() to the Faster_Data class, we can mimic this behavior. The function would be:

    * Escapes a value for use in a SQL statement.
    *
    * @param string The variable to encode.
    * @return string The encoded variable ready for use in a SQL statement.
    */
    public function escapeValue($s) {
        if(!empty($s)) { 
            return str_replace(array('\\', "\0", "\n", "\r", "'", '"', "\x1a"), array('\\\\', '\\0', '\\n', '\\r', "\\'", '\\"', '\\Z'), $s);
        }
        return $s; 
    } 

Even though Faster is to remain minimalist, this is such a commonly desired thing that it seems suitable to add it to the framework in the appropriate class, which would be the Faster_Data class.