issue cocos2d#175, add retain for CCCallFunc::m_pSelectorTarget

Author: Walzer

cocos2dx/actions/CCInstantAction.cpp

@@ -269,6 +269,14 @@ namespace cocos2d {
 	}
 	bool CCCallFunc::initWithTarget(SelectorProtocol* pSelectorTarget)
 	{
+		if (pSelectorTarget)
+		{
+			pSelectorTarget->selectorProtocolRetain();
+		}
+		if (m_pSelectorTarget)
+		{
+			m_pSelectorTarget->selectorProtocolRelease();
+		}
 		m_pSelectorTarget = pSelectorTarget;
 		return true;
 	}

cocos2dx/include/CCInstantAction.h

@@ -172,6 +172,10 @@ namespace cocos2d {
 		}
 		virtual ~CCCallFunc()
 		{
+			if (m_pSelectorTarget)
+			{
+				m_pSelectorTarget->selectorProtocolRelease();
+			}
 		}
 		/** creates the action with the callback