Add SchoolYear Model

[sean-dickinson]

What

• Add SchoolYear as a model so that is is possible to retain data from previous years while not confusing it with this year's data.

Context

• After the first year of the program, we will want to be able to archive the information and hide it from the interface while still keeping it for historical reporting. The idea here is that when viewing the admin interface, we would associate certain models with these school years so that it is possible to differentiate between the years. Models that would need to be associated with a school year would be:
  • Classrooms
  • Content Modules