update user dashboard style. #219
show event list.
list joined events.
update event new and edit page.
remove event partial.
fixed rspec error.
Merge pull request #222 from saberma/saberma-enhancement/update-dashboard-style

调整用户首页样式
save event group. #213
add event group slug route. #213
validate user login for event group slug. #213
add group_event_path. #213
Merge pull request #225 from saberma/saberma-feature/213-event-slug

定制活动链接
css filename use dash instead of underscore.
update README. #230
add event_participants_path link
#226: markdown guide
add event participants list view
add joined field to event_participants table
participant can check in event now
#226: change markdown guide label