(WIP) Class diagram transfer

A start at transferring content from the class diagram into code.  Focuses on School/Course/Klass/Educator/Student type models.  

@Dantemss I'd appreciate a once over of this PR if you have a chance.
And Educator records that a user is an educator in a klass.  So I think we need it (it is the parallel to Student, which I know we need).  Does that get to what you're asking?