Cache credentials into the node
To avoid having to fetch them again.
Add API merge into credentials
Take a [{'id':NODEID, 'type':TYPE, 'creds': CREDENTIALS}, ... ] as argument
Credentials saving into client-side node.
Credentials Stringify to send with the flow to the server.
Server-side managing of the credentials with the flow.
Removal of unneeded API in credentials
No more call from the editor to the delete credential API.
Adding documentation for the merge method.
Reject the promise if the type is not registered.
Correct an error-reporting that has been deleted.