user check in.
split checkin page and index.
show checkin result.
rasie error if checkin code has used.
add check in feature test.
show order items detail.
validate order status before check in.
add order status_name method.
magic encoding fixed.
remove unneccessary files. #493.
remove unneccessary files. #493.
fixed rspec error.
Merge pull request #537 from saberma/saberma-feature/536-checkin

活动管理员签到 #536