title: Google play services conflict with admob
body: <p>Unity3d 5.1.2.
  I'm trying to integrate ads and leaderboards into my game. I import the admob package and then when I start to i import the google-play-services package, the following error is shown:</p>
  
  <pre><code>Error importing folder (The pathName assets/plugins is already mapped to 21c47ce8563684fe3a95a29ca1a7aa32. But the meta data wants it to be mapped to fce8a713f1e5a4cc4b9973d1ef630f31)
  </code></pre>
  
  <p>Is there a way to resolve this issue?</p>