Fix internal bugs.

Pass masterKey data safely by ensuring the NSData holder is owned.

nameOfType: threw an unrecougnized-type error always, including for
recougnized types.

Swizzling broke when triggered on multiple levels of the hierarchy.

platform-darwin/Source/MPAppDelegate_Key.m

@@ -95,13 +95,13 @@
 - (void)storeSavedKeyFor:(MPUserEntity *)user {
 
     if (user.saveKey) {
-        MPMasterKey masterKey = [self.key keyForAlgorithm:user.algorithm];
+        NSData *masterKey = [self.key keyForAlgorithm:user.algorithm];
         if (masterKey) {
             [self forgetSavedKeyFor:user];
 
             inf( @"Saving key in keychain for user: %@", user.userID );
             [PearlKeyChain addOrUpdateItemForQuery:[self createKeyQueryforUser:user origin:nil] withAttributes:@{
-                    (__bridge id)kSecValueData: [NSData dataWithBytesNoCopy:(void *)masterKey length:MPMasterKeySize]
+                    (__bridge id)kSecValueData: masterKey
             }];
         }
     }