gradle: update to 2.1 and android targetSdk 21

- add android-appcompat subproject

vtm-web/src/org/oscim/gdx/emu/com/badlogic/gdx/backends/gwt/GwtGraphics.java

@@ -333,4 +333,10 @@ public class GwtGraphics implements Graphics {
 	public GL30 getGL30() {
 		return null;
 	}
+
+	@Override
+	public long getFrameId() {
+		// TODO Auto-generated method stub
+		return 0;
+	}
 }

vtm-web/src/org/oscim/gdx/emu/com/badlogic/gdx/backends/gwt/GwtInput.java

@@ -944,4 +944,16 @@ public class GwtInput implements Input {
 	private static final int KEY_BACKSLASH = 220;
 	private static final int KEY_CLOSE_BRACKET = 221;
 	private static final int KEY_SINGLE_QUOTE = 222;
+
+	@Override
+	public boolean isKeyJustPressed(int key) {
+		// TODO Auto-generated method stub
+		return false;
+	}
+
+	@Override
+	public boolean isCatchBackKey() {
+		// TODO Auto-generated method stub
+		return false;
+	}
 }