show participant created_at.
Merge pull request #606 from saberma/saberma-enhancement/participants-index-order-by-id

签到列表显示按id倒序排列
password typo in config/database.yml.example.mysql2
Merge pull request #610 from lytsing/master

password typo in config/database.yml.example.mysql2
 add ng-cloak to all elements for good experience
Merge pull request #612 from 19wu/cloak_fix

 add ng-cloak to all elements for good experience
update order stat rule.
Merge branch 'master' of git://github.com/19wu/19wu