title: version numbers in gradle
body: <p>Anyone know how to get this working in gradle for a SUBPROJECT so that running the left hand size results in the right hand archive name...</p>
  
  <pre><code>gradle assemble -&gt; databus-Developer-Build.zip
  gradle -DmyVersion=1.0.2 assemble -&gt; databus-1.0.2.zip
  OR
  gradle -PmyVersion=1.0.2 assemble -&gt; databas-1.0.2.zip
  </code></pre>
  
  <p>I have tried and tried with a variable myVersion but it always says it does not exist....and in half the cases, it shouldn't exist because I didn't supply it!!!!!</p>
  
  <p>How to get this working in a subproject?</p>
  
  <p>thanks,
  Dean</p>