implemented the Lecturer + the Student functions
fixed a small error in the checkCompulsory() method
Update Student.java

changed matricNo to integer
Update LControl.java

change to teaching session constructor
Update StudentInterface.java

changed matricNo to integer
Update TeachingSession.java

changed the constructor.. add/remove pupil methods included
Update SControl.java

changed matricNo to integer
Merge pull request #1 from dee-m-dobrev/Lecturer-+-Student-functions-implementation

Lecturer + student functions implementation