Protect the store file with iOS security features.

MasterPassword/MPAppDelegate.m

@@ -422,6 +422,11 @@
         @throw [NSException exceptionWithName:error.domain reason:error.localizedDescription
                                      userInfo:[NSDictionary dictionaryWithObject:error forKey:@"cause"]];
     }
+    
+    if (![[NSFileManager defaultManager] setAttributes:[NSDictionary dictionaryWithObject:NSFileProtectionComplete
+                                                                                   forKey:NSFileProtectionKey]
+                                          ofItemAtPath:storeURL.path error:&error])
+        err(@"Unresolved error %@, %@", error, [error userInfo]);
     [__persistentStoreCoordinator unlock];
     
     return __persistentStoreCoordinator;