fixed email received twice.
Merge pull request #555 from saberma/saberma-bug/553-duplicated-email

修正收到两份重复邮件的问题 #553
merge duplicated ordered events in events#ordered

  如果对一个活动提交过多个订单，之前会在“参加的活动”页面显示多次。
  本次改动对参加的活动做去重处理。
add jasl

remove history
Update repo link in README
Merge pull request #560 from doitian/update-repo-references-in-readme

Update repo link in README
Merge pull request #558 from Lax/pull_requests/merge_ordered_events

merge duplicated ordered events in events#ordered
Update gemnasium badge link.
move repo.
merge master.
Merge pull request #562 from saberma/saberma/559-move-repo

修改项目地址 #559