edited ZombieTask to conform to new storage api
Merge branch 'Storage' into mainlogic
none critical edits to zombietask - testing view and add commands with
storage
Merge branch 'Storage' into mainlogic

Conflicts:
	ZombieStorage.txt
Merge branch 'Storage' into mainlogic
updated UI printAgenda function to avoid array overflow
edited wrong implementation of while loop (array overflow)
updated main logic
- err to display message
- view and agenda tentatively working
updated delete command -> added storage.delete
Merge branch 'Storage' into mainlogic
edited storage.displayall in main logic
updated updateTask in main logic.
Add readFile() into every method
add exceptions after adding the readFile();
add second deadline(deadline2) for Task Class
update the Task Class to two deadlines and getters, setters and has()
methods are added.   
storageAPI can solve comparison without date. search(calendar,calendar)
has been updated.