Add captcha to registration form
Merge branch 'trunk' of https://github.com/voer-platform/vpw

# By Luong Trieu (3) and vietdt (2)
# Via Luong Trieu
* 'trunk' of https://github.com/voer-platform/vpw:
  feature user favorited
  common script
  add server error page
  create 404 page
  complete unpublish of user