title: context?.save(nil) coming up with error
body: <p>Using Xcode 7 and swift 2.0 if get the following error on the context?.save(nil).</p>
  
  <p>Any help is appreciated</p>
  
  <p>"cannot use optional chaining on non-optional value of type 'NSManagedObjectContext'</p>
  
  <pre><code>func newItem() {
      let context = self.context
      let ent = NSEntityDescription.entityForName("CallList", inManagedObjectContext: context)
  
      let nItem = CallList(entity: ent!, insertIntoManagedObjectContext: context)
  
      nItem.firstname = firstName.text
      nItem.lastname = lastName.text
      nItem.phonenumber = phoneNumber.text
      context?.save(nil)
  </code></pre>