add inherited_resources gem
routes for operators
update the application layout
add operators controller through InheritedResourse
add new page for operator
add edit page for operator
add form partial for operator
add index page for operator
rake db:drop db:create db:migrate
remove blank space
add accepts_nested_attributes_for credential in model operator
remove email for credential that use devise
rails generate devise Credential
remove the comment for used devise as authenticate_credential!
Merge pull request #11 from hxx/Operator-CRUD

Operator crud