title: Unable to set "Team" to "None" in Xcode
body: <p>I'm exactly using Xcode 6.3.2, and I was given a project where the "Team" in its target was set to a certain one, and I see this setting as "Unknown" (since I don't have an account associated to this team). I'm trying to set this to "None" but Xcode doesn't allow me to do that. I don't receive any warning when selecting "None" from the drop-down list, it simply ignores the selection and returns to the "Unknown" value.</p>
  
  <p>How could I solve this?</p>
  
  <p>Thanks </p>