Refactor create_project, create_user, register_user about lightning HOT 1 OPEN

For discussion later, I spoke about this with @midigofrank and we found the spot that changed.

Before this commit, create_project only created projects. The pattern in use was:

def some_save_button do
  create_project
  send_email
end

and that's exactly what I'd like to see. In the commit above create_project got modified so that it really is create_project_and_send_email, and the other parts of the app that call create_project are now trying to send emails. (It's not many I don't think, but it's still a significant change in what that deep "crud-sounding" function does.)

For what it's worth, the only impacted places here are setup_utils and the load tests.

from lightning.