Demo version
There are problems I couldn't fix

Knob is not in the center….
Backgound problem.
Fixed knob problem
Change the title
Final change on UI
Merge branch 'Weilong'
Merge branch 'Enwei'

Conflicts:
	PassTheBomb/bin/com/passthebomb/model/local/Character.class
	PassTheBomb/bin/com/passthebomb/model/local/Player.class
	PassTheBomb/bin/com/passthebomb/view/gui/Background.class
	PassTheBomb/bin/com/passthebomb/view/screen/GameScreen.class
	PassTheBomb/bin/com/passthebomb/view/screen/WaitScreen.class
	PassTheBomb/src/com/passthebomb/model/local/Character.java
	PassTheBomb/src/com/passthebomb/model/local/Player.java
	PassTheBomb/src/com/passthebomb/view/gui/Background.java
	PassTheBomb/src/com/passthebomb/view/screen/GameScreen.java
Resolve all the conflicts...
Implemented returnToMain