add chrome support; fix two text grabbing problems; eliminate unused lookup queue concept

mining.html

@@ -11,6 +11,7 @@ body
     font-size: 1em;
 }
 </style>
+<script src="include/browser-polyfill.min.js" charset="UTF-8"></script>
 <script src="mining.js" charset="UTF-8"></script>
 </head>