title: Adding size classes to an existing Xcode project
body: <p>I have an universal application with deployment target 6.1 and above. The application is already in app store. Now I need to make changes as per new requirements and also update it for iOS 8.1. I have two storyboards with auto-layout as "Main_iPhone" and "Main_iPad".</p>
  
  <p><strong>Question:</strong>
  I want to implement size classes now. What are the necessary changes I need to make inside the application or project settings ?</p>
  
  <p>Can I just delete those two storyboards and create a new one and re-design everything or any other better feasible ways are there ?</p>
  
  <p>Note: A detailed bullet steps for necessary changes will be very helpful.
  I know auto-layout(Intermediate level). Beginner in case of "Size classes".</p>
  
  <p>Thanks in advance. Happy coding.</p>