title: what are the valid colors for mercurial's color extension?
body: <p>Mercurial's <code>color</code> <a href="http://mercurial.selenic.com/wiki/ColorExtension" rel="nofollow noreferrer">extension</a> is great and all, but there isn't a list on that page of what the valid colors are. I looked for a python file named color, hoping I'd be able to read the source and see it there, but no luck. I was hoping to use grey or light grey for a color but it wasn't valid. Grey (or gray) seems like a pretty likely color to be in a list of colors. </p>
  
  <p>Where can I find a list of valid colors for the <code>color</code> extension? Or where can I find the source for the <code>color</code> extension? </p>