rm add_vote in model Answer
mv .hidden class to base.css
add answer vote urlpattern
template view for vote
rm add_vote in model Answer

remove useless debug print
Update README.md,  add demo url
change datetime format
rm  css boxshadow effect
move js link before </body>
structure js file properly

rm unused js library  and template
mv script from html,  create modal popup tools js
put script after dependent js library
ajax vote unvote
add ajax-loading gif
asquestion: ajax-loading class