title: CocoaPods - pod setup Failed: /usr/bin/git checkout master
body: <p>After I run <code>$sudo gem install cocoapods</code> and then <code>$pod setup</code>, there is an error. Please help me to fix it.</p>
  
  <pre><code>[!] Pod::Executable pull
  
  Updating eaf98af..ba3c030
  error: Your local changes to the following files would be overwritten by merge:
  
      Google-Maps-iOS-SDK/1.3.0/Google-Maps-iOS-SDK.podspec
  
  Please, commit your changes or stash them before you can merge.
  
  Aborting
  </code></pre>