Add streaming support Parser api

public interface StreamParser
{
    Syntax getSyntax();

    /**
     * @param listener receive event for each element
     * @param source the content to parse
     * @throws ParseException if the source cannot be read or an unexpected error happens during the parsing. Parsers
     *             should be written to not generate any error as much as possible.
     */
    void parse(Reader source, Listener listener) throws ParseException;
}