title: CocoaPods: There are duplicate dependencies on `AFNetworking` in `Podfile`
body: <p>I'm trying to use AFNetworking on my WatchOS2 project which requires AFNetworking version 2.6.  My iPhone app is using RestKit which requires AFNetworking version 1.3.6.</p>
  
  <p>I have the following in my cocoapods file.</p>
  
  <pre><code>source 'https://github.com/CocoaPods/Specs.git'
  platform :ios, '7.0'
  
  target 'MyApp', :exclusive =&gt; true do
    pod 'AFNetworking', '1.3.4'
    pod 'RestKit', '~&gt; 0.25.0'
    pod 'SDWebImage', '~&gt;3.7.3'
  end
  
  target 'MyApp WatchKit Extension', :exclusive =&gt; true do
    pod 'AFNetworking', '2.6.0'
  end
  </code></pre>
  
  <p>I'm getting the following error..</p>
  
  <blockquote>
    <p>Analyzing dependencies [!] Unable to satisfy the following
    requirements:</p>
    
    <ul>
    <li><code>AFNetworking (= 1.3.4)</code> required by <code>Podfile</code></li>
    <li><code>AFNetworking (= 2.6.0)</code> required by <code>Podfile</code></li>
    </ul>
  </blockquote>
  
  <p>Shouldn't this work since I have ":exclusive => true" set for my target?  It should be able to build each target with a different version of AFNetworking right?</p>
  
  <pre><code>pod --version : 0.38.2
  </code></pre>