create event_usership table
let the user and event associated with the event_usership
run rake db:migrate command to create table in database
join event is work now
add test code by EventsController#join method
add initialization account by seed
add initialization account
Add uploadable input
Don't add empty line when textarea is empty
Use uploadable input
Merge pull request #196 from caok/issue/193-add-initialization-account

add initialization account by seed
Use mixin instead of copying
Remove unnecessary class
Remove unnescessary styles
Tweak css
add time merge for event. #162
Merge branch 'feature/186-github-style-upload' of git://github.com/yesmeck/19wu into yesmeck-feature/186-github-style-upload
fixed sqlite null column contraint error. #197
Merge pull request #2 from saberma/master

update code
fixed conflict.