add non-ascii data to toy dataset

common/test/data/toy/html/secret/toylab.html

 <b>Lab 2A: Superposition Experiment</b>
 
 <p>Isn't the toy course great?</p>
+
+<p>Let's add some markup that uses non-ascii characters.
+For example, we should be able to write words like encyclop&aelig;dia, or foreign words like fran&ccedil;ais.
+Looking beyond latin-1, we should handle math symbols:  &pi;r&sup2 &le; &#8734.
+And it shouldn't matter if we use entities or numeric codes &mdash; &Omega; &ne; &pi; &equiv; &#937; &#8800; &#960;.
+</p>