change format of stored tasks (XML)
changed according to Version 6
update history class now can be used
Added commandAddTest and commandDeleteTese
rename file for pushing to team member
changed test function
Change the UI, made it looks nicer now.
Added the junit tests for add
Merge branch 'Stanley's_Branch' into linh-dev
Changed code for CommandAddTes
Tried the stub. Not complete
Added assertion to TAsk
CommandEdit. Editting all the fields.
Change FileStorage, fix a bug, add Test files
changes the test and part of sort
editing
Merge commit 'bed53ad7db24bc4d29651d623ebabb7d1d30d65b' into vani's_branch

Conflicts:
	src/todologApp/CommandEdit.java
	src/todologApp/Controller.java
	src/todologApp/FileStorage.java
	src/todologApp/History.java
	src/todologApp/Task.java
	src/todologApp/TaskTest.java
	src/todologApp/ToDoListTableModel.java
	src/todologApp/UserInterface.java
no message
added sortByDate method so that it sorts when the task is added.
completed sorting while adding
final changes to commandAdd for sorting