title: containerURLForSecurityApplicationGroupIdentifier returns nil on iOS Simulator
body: <h1>Context</h1>
  <p>With iOS8 and extensions Apple introduced the App group containers (<a href="https://developer.apple.com/library/ios/documentation/General/Conceptual/ExtensibilityPG/ExtensionScenarios.html" rel="noreferrer">more info here</a>).</p>
  <h1>Problem</h1>
  <p>We use it through <code>NSFileManager</code>'s <code>containerURLForSecurityApplicationGroupIdentifier:</code> method. It works well in production on AppStore (with both iOS8 and iOS7). Problem is since our team updated to <code>Xcode 6.1 (6A1052d)</code>, the method returns <code>nil</code> on Simulators.</p>
  <p>We searched a lot but we didn't manage to find any clues. Even this <a href="https://stackoverflow.com/questions/22574990/containerurlforsecurityapplicationgroupidentifier-gettting-nil-value">question</a> or <a href="https://stackoverflow.com/questions/21048742/how-containerurlforsecurityapplicationgroupidentifier-in-nsfilemanager-works-on">this one</a> are not applicable here.</p>
  <h1>TLDR: Question</h1>
  <p>Does <code>NSFileManager</code>'s <code>containerURLForSecurityApplicationGroupIdentifier:</code> method works on your simulators? Is there any way to fix that?</p>