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
#226: markdown guide
#226: change markdown guide label
#226: add content to the markdown guide
simplify compound datetime html
extract common form code in events new and edit views
update css for better responsive event form
do not float compound-datatime time part right
Merge branch 'feature/226-markdown-guide' of git://github.com/windduke/19wu into windduke-feature/226-markdown-guide
change all tab to space.
merge.