- 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.js

@@ -0,0 +1,8 @@
+/* eslint-disable no-var */
+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);