init setting for activity such as db and controller
can make new activity
can choose activity when creating notice
edit and show activity
refactoring edit and index page
delete all notices when deleting activity
fix: activities...
fix error in migration
fix conflict error
refactoring scope and erasing unused files
fix error in test
fix conflict errors
Merge pull request #374 from DonutWorks/feature/born-activity

#373 Feature/born activity