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
add type item fee to dasbooar
add item to students
add show item_fee by automatic calculation
add field active
modific select of typeItem, add filter
Merge pull request #5 from PlumLabs/ra/AddItemFee

Ra/add item fee
:2
Add student Search in coursers
Add register a student and unregister method
Merge pull request #6 from PlumLabs/ed/course

Add a student to a course
So so my friends :p
add edit person, and modify sub_header
validare over 18 age of member
factorized code into csss, and unifique sub_head