title: How do I rename my Xcode project without losing my data?
body: <p>How do I rename my Xcode project (aka .xcodeproj) without losing my data? It gives me an error like this before breaking my whole project: </p>
  
  <blockquote>
    <p>The file for the container that was at
    <em>appName</em>.xcodeproj/project.xcworkspace has disappeared. Do you want to re-save the container or close it?</p>
  </blockquote>
  
  <p>I am using Xcode 6.3.1</p>