Adding some color parsing tests to the test suite

This SVG document:

<svg width="100%" height="100%" viewBox="0 0 480 300"
      xmlns="http://www.w3.org/2000/svg" xml:space="preserve">
   <g transform="translate(10, 15)" id="games-all">
     <title>players</title>
     <text id="headers" x="0" y="10">
       <tspan x="40" fill="eee">This should not be gray</tspan>
     </text>
   </g>
</svg>

is rendered incorrectly by at least some user-agents.  I've reported 
bugs against the two I know of 
(https://bugs.webkit.org/show_bug.cgi?id=46112 and 
DSK-314092@bugs.opera.com if the working group needs to follow up), but 
it would be good to add some tests for color parsing to the test suite 
to catch these things....

-Boris