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。
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
fixed rspec error.
fixed ActiveRecord::RecordNotFound error when we create collaborator.
do not use gravatar and baidu map in test enviroment.
Merge pull request #563 from saberma/saberma/fixed-rspec-error

修正 travis-ci 随机出现的几个问题
Merge pull request #564 from saberma/saberma-enhancement/stub-gravatar-and-baidu-map-in-test

测试环境不使用 gravatar 和 百度地图