title: Get Xamarin toolchain version information from command line
body: <p>I want to ensure that the correct version of mdtool, mono, the sdk and xamarin.android/ios is installed on  our CI environment. For that, my idea is to add a version check in the Jenkins/Ant Buildprocess which prevents the build from executing, if the correct version is not installed. </p>
  
  <p>I can receive <a href="http://developer.xamarin.com/guides/cross-platform/getting_started/beginning_a_xamarin_trial/Images/starter.png" rel="nofollow">all the relevant information from xamarin studio</a>, but how do I get the same thing from the command line? Neither xbuild, nor mdtool provide me with a version. If I start a build with mdtool, the most relevant thing that comes up is this here:</p>
  
  <pre><code>build-android:
       [echo] Building for android
       [exec] XBuild Engine Version 3.2.6.0
       [exec] Mono, Version 3.2.6.0
       [exec] Copyright (C) Marek Sieradzki 2005-2008, Novell 2008-2011.
  </code></pre>
  
  <p>Is there a way to receive the complete version information?</p>