title: Colorize plantuml activity diagram
body: <p>I want to set a custom skin for my activity diagrams. I only managed to set the skin for activities:</p>
  
  <pre><code>skinparam activity {
      BackgroundColor #AAAAAA
      BorderColor #BBBBBB
  }
  </code></pre>
  
  <p>Is it possible to set custom colors for conditions and loops, too?</p>
  
  <p>Thanks in advance!
  Max</p>