HW4

Added graphics. Three basic moves are tested and so far no bugs found.
Merge branch 'master' of https://github.com/chongzizil/Banqi

Conflicts:
	.classpath
	.project
	src/org/banqi/BanqiGame.gwt.xml
	src/org/banqi/client/BanqiLogic.java
	src/org/banqi/client/BanqiPresenter.java
	src/org/banqi/client/GameApi.java
	src/org/banqi/graphics/BanqiEntryPoint.java
	src/org/banqi/graphics/BanqiGraphics.java
	src/org/banqi/graphics/BanqiGraphics.ui.xml
	src/org/banqi/graphics/PieceImage.java
	src/org/banqi/graphics/PieceImageSupplier.java
	src/org/banqi/graphics/PieceImages.java
	src/org/banqi/graphics/SquareImage.java
	src/org/banqi/graphics/SquareImageSupplier.java
	src/org/banqi/graphics/SquareImages.java
	tests/org/banqi/client/BanqiPresenterTest.java
	war/.gitignore
	war/WEB-INF/.gitignore
	war/WEB-INF/appengine-web.xml
	war/WEB-INF/logging.properties
	war/WEB-INF/web.xml