Merge branch 'release/import_csv' into develop
add uniqueness of participator; csv format check
Merge branch 'develop'
fix csv open on heroku
Merge branch 'develop'
try to fix heroku upload
Merge branch 'develop'
fix issues about heroku
Merge branch 'develop'
do some refactor
bug fix
refactor again
refactor again
refactor again and again
merge ui from yklee1013
fix ui
merge from yklee1013
format
merge pr
Merge pull request #1 from railsgirls-china/master

改了一点小毛病  -jasl