title: CocoaPods use locally modified Pods
body: <p>I would like to use an existing pod, modify it to fit my needs and finally use it in my Podfile.</p>
  
  <p>So far for the pod I did :</p>
  
  <ul>
  <li>edit the code</li>
  <li>commit the new code into a new branch</li>
  <li>remove the github origin in the pod's podsspec</li>
  <li>specify the new branch in my podfile with  <code>:branch</code></li>
  </ul>
  
  <p>Now I'm stuck because I cannot get CocoaPods to checkout the modified pod. I tried with :git => 'file:///vendor_custom/test' but it doesn't seems to take into account a relative path. I also copied the .git content and changed it to bare repository type. No luck.</p>
  
  <p>Any pointers? Thanks</p>