title: How do I force SBT plugins and plugins to be downloaded through Nexus?
body: <p>I think that by now I figured out how to force project dependencies to be downloaded through Nexus. (I did that by explicitly setting <code>externalResolvers</code> to a <code>Seq</code> with only one value:</p>
  
  <pre><code>override lazy val settings = super.settings ++ Seq(
    externalResolvers := Seq("Nexus repository" at "http://.../nexus/content/groups/public/")
  )
  </code></pre>
  
  <p>However, if I drop my Ivy cache, SBT still accesses a number of public repositories for getting the plugins. Ideally I would like that to go through Nexus as well, to make sure we are not dependent on those repositories to exist forever. (Which they don't.)</p>
  
  <p>Any clues? (I'm on SBT 0.11.2)</p>