Make the scread can deal with the keyword.

    Make the scread can deal with the
    keyword, when you input the keyword
    after the filename, the scread will
    just output the ast node about the
    keyword. It is judged by the ast
    spelling.

    If you just input the filename after
    the scread, scread will output all the
    ast node information, exception the first
    node. Because it is about the file. We
    will deal with it later.