Fix display function by modifying toString in Task. [null] for time was because when retrieving from txt file, null is read as String
Add case for Edit. Uncomment line to use
Merge branch 'UI' of https://github.com/cs2103aug2014-t10-4j/main into UI
Merge branch 'UI'
Merge branch 'master' of https://github.com/cs2103aug2014-t10-4j/main

Conflicts:
	src/DoubleUp.java