Renamed the GUI to UserView

To avoid confusion. Since UserView and Controller handle GUI stuff
together.
Merge branch 'Xuehe-for-V0.1-demo' of https://github.com/cs2103aug2014-t10-3j/TaskBar-WalkingSkeleton into Xuehe-for-V0.1-demo

Conflicts:
	bin/taskbar/GUI.class
	src/taskbar/GUI.java