added 4 methods. 

calculateTaskPercentageCompleted(double taskDone) will calculate tasks
that are completed for each member and the tasks the group have
completed.

calculateTaskPercentageNotCompleted(double taskDone)will calculate tasks
that are not completed for each member and the tasks the group have not
completed.

calculateMemberLevel(double taskPercentage) will rate a member's level
in terms of how many tasks they completed and the group to which they
belong to.
updated
updated
Merge branch 'master' of https://github.com/waseem24/TheToDoList.git

Conflicts:
	ToDoList V2.0/src/com/todolist/dao/PerformanceDao.java
	ToDoList V2.0/src/com/todolist/dao/impl/PerformanceDaoImpl.java
updated