Deleted old class
Define person class
Added Student class
Added Teacher class
Added Subject class
Aded initialize to Subject class
Added a controller to manage all the relations
Added a method to retrieve all Teachers, and count all Teachers. Added options to the menu
Modified the menu, added setters and getters to the Student class
Added a module that returns the collection of objects
Modified the teacher class to make use of the Collections module
Clean up student class.
User can now add a student
Merge pull request #10 from OscarSwanros/feature/add-students

feature/add-students
User can now add a new subject
Merge pull request #11 from OscarSwanros/feature/add-subjects

feature/add-subjects
All objects now have a name and an Id
Defined method to add a student to a subject
Collections now returns each instance of the class in format array
Added a method that returs a Subject object based on an Id