title: Disable additional jars for the maven-shade-plugin
body: <p>I am using the maven-shade-plugin to create a single executable jar.
  I would expect the plugin to create a single jar (<code>foo.jar</code>) in the target directory.
  However it will also create two other jars: <code>original-foo.jar</code> and <code>foo-shaded.jar</code>.</p>
  
  <p>Why does it create those files and how do I disable this behavior?</p>
  
  <p>(We have another project using that plugin, where those files are not created. Therefore I am pretty sure it is possible to disable those, but I could not see the difference.)</p>