#346 show checkin code and qrcode on checkin page
#346 add :checkin action to event controller
#346 user can checkin through checkin form on event page
#346 user can only checkin on the event start day
#346 show checkin status in sidebar
add feature spec & convert js to coffeescript
#346 rebase to lastest code base
#346 fix Travis build failure cased by defect in feature spec
Enable js in checkin feature test on demand.
Events checkin refactoring.
Merge pull request #2 from doitian/master

Refactoring and reorganze feature test js flags
fixed unexpected ajax request from angular strap popover directive. #369
Merge pull request #3 from saberma/try-to-fix-pr-368-travis-error

修正 Travis-CI 的问题
Merge pull request #369 from loveky/issue#346

Issue#346 用户自行签到