project belongs to their parent and has many children
revise error typing in project
project belongs to their parent and has many children
revise error typing in project
Merge branch 'Changhee' of https://github.com/kkammo/yonseitree into Changhee

Conflicts:
	app/models/project.rb
add like comment
project belongs to their parent and has many children
project belongs to their parent and has many children
project belongs to their parent and has many children
revise error typing in project
Merge branch 'Changhee' of https://github.com/kkammo/yonseitree into Changhee

Conflicts:
	app/models/project.rb
	db/schema.rb
Merge commit '32842d5bfe675ed6d95ca02f0a7a05fea936ce59' into develop

Conflicts:
	app/models/project.rb
	app/views/projects/show.html.erb
Merge commit 'ed34064776f44ab1981cdd1b0cb95cc3f5765574' into develop

Conflicts:
	app/controllers/projects_controller.rb