- Testing (math_test): Fix undeclared variables

- Testing: Move JavaScript out of HTML to own files
- Linting: ESLint; unfinished: editor/extensions/, editor/ (root); some of test

test/all_tests.html

@@ -22,13 +22,5 @@
   <iframe src="coords_test.html" width="100%" height="70" scrolling="no"></iframe>
   <iframe src="recalculate_test.html" width="100%" height="70" scrolling="no"></iframe>
 </body>
-<script>
-window.setTimeout(function() {
-  var iframes = document.getElementsByTagName('iframe');
-  for (var i = 0, len = iframes.length; i < len; ++i) {
-    var f = iframes[i];
-    f.style.height = (f.contentDocument.body.scrollHeight + 20) + 'px';
-  }
-}, 5000);
-</script>
+<script src="all_tests.js"></script>
 </html>