update butterfly parser

use BeautifulSoup4
use select api to find body content
adjust indent

Signed-off-by: Young-Ho Cha <ganadist@gmail.com>
update dragon_of_esoril parser

use BeautifulSoup4

Signed-off-by: Young-Ho Cha <ganadist@gmail.com>
add page break on dragon_of_esoril

Signed-off-by: Young-Ho Cha <ganadist@gmail.com>
[FIXME] do not apply patches for butterfly

Currently, patches are broken.
fix later

Signed-off-by: Young-Ho Cha <ganadist@gmail.com>