Use Apple's KeychainItemWrapper in ARC project from @ErikEvenson

KeychainItemWrapper in ARC

Thanks to  ErikEvenson https://github.com/ErikEvenson

I did three things to use Apple's current sample code in my ARC projects:
1) Set -fno-objc-arc as a compiler flag on KeychainItemWrapper.m under Build Phases, Compile Sources.
2) Use __bridge_transfer in the call to the wrapper: NSString *password = [wrapper objectForKey:(__bridge_transfer id)kSecValueData];
3) Add an autorelease to line 196 of Apple's code to plug Apple's memory leak: self.keychainItemData = [[[NSMutableDictionary alloc] init] autorelease];


Another solution which rewrites the code in ARC can be found here
https://gist.github.com/1170641