title: Xcode Auto Layout issue with constraints
body: <p>I just started learning Auto Layout yesterday and i'm having a hard time understanding these constraints stuff. I thought I was doing auto layout correctly because my storyboard shows no issues with auto layout and constraints. I got all the UIImageViews where I wanted them in all devices. However, when I build,run a simulator in debug area I get...</p>
  
  <pre><code>     Unable to simultaneously satisfy constraints.
  Probably at least one of the constraints in the following list is one you don't want. 
  Try this: 
      (1) look at each constraint and try to figure out which you don't expect; 
      (2) find the code that added the unwanted constraint or constraints and fix it. 
  (
  "&lt;NSLayoutConstraint:0x7fabb1d689f0 H:[UIImageView:0x7fabb1d68820(70)]&gt;",
  "&lt;NSLayoutConstraint:0x7fabb1e983c0 UIImageView:0x7fabb1d68820.centerX == UIView:0x7fabb1d654c0.centerX - 265&gt;",
  "&lt;NSLayoutConstraint:0x7fabb1e98460 UIImageView:0x7fabb1d68820.leading == UIView:0x7fabb1d654c0.leadingMargin    - 20&gt;",
  "&lt;NSLayoutConstraint:0x7fabb1e993c0 'UIView-Encapsulated-Layout- Width' H:[UIView:0x7fabb1d654c0(1024)]&gt;"
   )
  </code></pre>
  
  <p>I get the above message in debug area. Also, when the simulator finally loads the UIImageViews are all stretched for some reason.</p>