Finish integrating node keys and fix all tests.

api/client.go

api/client_test.go

api/mockserver.go

api/mockserver_test.go

api/notifications_test.go

api/register.go

api/register_test.go

bindings/client.go

bindings/client_test.go

crypto/encrypt.go

io/send.go

storage/session.go

storage/session_test.go

user/session.go