Add an function for optional statistic. Update privious code.
Merge branch 'master' of https://github.com/minhy/happy-water

# By HieuHuynh (9) and others
# Via phamnhathuan (4) and others
* 'master' of https://github.com/minhy/happy-water: (35 commits)
  modified recommended
  modified recommended
  Lộc: fix bug, thêm thanks.cfm
  no message
  thien
  modified multiform
  edit servey again
  fix css category index
  upload images and modified news
  edit contact
  fix header
  fix lỗi shopping cart trong login page thêm tiêu đề cho page trong product details
  modified articleform,article_detail and multiform
  Modified questionform
  fix layout full screen
  Thien
  modified article_detail
  Modified Article_Detail
  lỘC: edit
  admin view
  ...