Disables retina display by default, and makes it possible to use or not to use retina display.

Former-commit-id: 428d16c

Author: vlidholt

cocos2d/CCDirector.m

@@ -331,7 +331,7 @@ -(void) setView:(CCGLView*)view
 #ifdef __CC_PLATFORM_IOS
 		CGFloat scale = __view.layer.contentsScale ?: 1.0;
 #else
-		self.view.wantsBestResolutionOpenGLSurface = YES;
+		//self.view.wantsBestResolutionOpenGLSurface = YES;
 		CGFloat scale = self.view.window.backingScaleFactor;
 #endif