Merge branch 'develop-v3' of https://github.com/apportable/cocos2d-iphone into develop-v3

Former-commit-id: ef32fb1

Author: vlidholt

cocos2d/CCResponderManager.m

@@ -478,9 +478,7 @@ - (void)cancelResponder:(CCRunningResponder *)responder
 // -----------------------------------------------------------------
 
 - (void)mouseDown:(NSEvent *)theEvent button:(CCMouseButton)button
-{
-    NSAssert(![self responderForButton:button], @"Unexpected Mouse State");
-    
+{    
     if (_dirty) [self buildResponderList];
 
     // scan backwards through mouse responders