Add index subject and little change in some models
Merge pull request #1 from PlumLabs/sc/views_controller_subject

Add index subject and little change in some models
Add reference to User in Course model
Merge pull request #2 from PlumLabs/ed/course

Add reference to User in Course model
Add modality to TypeCourse
Merge pull request #3 from PlumLabs/ed/course

Add modality to TypeCourse
Changes type of hours and Add callback to create subject
Add new and edit to Courses
Merge pull request #4 from PlumLabs/ed/course

Add Course
Merge pull request #12 from PlumLabs/master

rebase from PlumLabs master