Fix memory leaks in protocol

protocols/platform/ios/AdsWrapper.mm

@@ -76,7 +76,7 @@ + (NSString*)buildVersion
 
   // adapted from http://stackoverflow.com/questions/25540140/can-one-determine-the-ios-sdk-version-used-to-build-a-binary-programmatically
   // form character set of digits and punctuation
-  NSMutableCharacterSet *characterSet = [[NSCharacterSet decimalDigitCharacterSet] mutableCopy];
+  NSMutableCharacterSet *characterSet = [[[NSCharacterSet decimalDigitCharacterSet] mutableCopy] autorelease];
 
   [characterSet formUnionWithCharacterSet: [NSCharacterSet punctuationCharacterSet]];
 

protocols/platform/ios/ParseUtils.m

@@ -47,7 +47,7 @@ + (NSString *) NSDictionaryToNSString:(id)dic{
     if (! jsonData) {
         NSLog(@"Got an error: %@", error);
     } else {
-        result = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
+        result = [[[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding] autorelease];
     }
     return result;
 }

protocols/platform/ios/PluginFactory.mm

@@ -116,6 +116,7 @@ of this software and associated documentation files (the "Software"), to deal
 			pRet->setPluginName(name);
 			PluginUtilsIOS::initOCPlugin(pRet, obj, name);
 		}
+        [obj release];
 	} while(0);
 
 	return pRet;

protocols/platform/ios/PluginUtilsIOS.mm

@@ -34,7 +34,7 @@ of this software and associated documentation files (the "Software"), to deal
 void PluginUtilsIOS::initOCPlugin(PluginProtocol* pPlugin, id ocObj, const char* className)
 {
     PluginOCData* pData = new PluginOCData();
-    pData->obj = ocObj;
+    pData->obj = [ocObj retain];
     pData->className = className;
     PluginUtilsIOS::setPluginOCData(pPlugin, pData);
 }