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