title: Update users Email in Parse
body: <p>I have PFUser object and it has firstName, lastName and Email.</p>
  
  <p>When I try to update the user's email which is already exist, i am receiving error. But when fetch the email from [PFUser currentUser], it returns wrong email, how to overcome this. Below is the my code for it.</p>
  
  <pre><code>PFUser *user = [PFUser currentUser];
  user[@"email"] = @"test@gmail.com"
  [user saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
         //UI refresh
      }];
  </code></pre>
  
  <p>I received the following error : 
  the email address test@gmail.com has already been taken (Code: 203, Version: 1.7.4)</p>
  
  <p>After this when fetching the email for current user</p>
  
  <pre><code>PFUser *user = [PFUser currentUser];
  NSString *email = user[@"email"];
  NSLog("email %@", email);
  </code></pre>
  
  <p>I received the following email "test@gmail.com" but which is wrong, which should be "tester@gmail.com".</p>
  
  <p>FYI : I am also using parse offline store.</p>