remove useless dir-list when download resources

Signed-off-by: coldnew <coldnew.tw@gmail.com>
When export as HTML, indent buffer to make debug more easy

Signed-off-by: coldnew <coldnew.tw@gmail.com>
update menu entry based on ox-html.el

Signed-off-by: coldnew <coldnew.tw@gmail.com>
reindent code

Signed-off-by: coldnew <coldnew.tw@gmail.com>
Merge branch 'develop'