Models

PR for code review 
Sure. These were auto-generated. `rails g model`

One question, when I create a model inside a module, this is the command I'm using:
```rails g model Course::AssignedWork```
While the class file was generated inside the `course` directory, inside the class it's
```class Course::AssignedWork```
I was expecting this
```
module Course
   class AssignedWork
```
any difference?