Improve spec helper
Fix I18n locale file for enumrize
Add Event model
Add Attendance model
Add Event#join & Event#leave methods
Add events routes
Add bootstrap_helper gem
Partialize menu on group
Add twitter bootstrap datetimepicker

@see
http://www.malot.fr/bootstrap-datetimepicker/
Add relation between group & event
Improve factories
Update common locale word
Implement event feature
Merge branch 'event'