Semi-implement scroll to updated area

Complete does not work as "completed" is changed in both old and new
list.
Lots of fine tuning is needed.
Merge branch 'V0.4_UI_updates' of https://github.com/cs2103aug2014-t17-3j/main into V0.4_UI_updates

Conflicts:
	src/main/java/com/the/todo/MainToDoController.java