Update charted to 0.4.8 and roll

packages/petitparser/example/lispweb/lispweb.dart

-library petitparser.example.lispweb;
-
-import 'dart:html';
-import 'package:petitparser/lisp.dart';
-
-void inspector(Element element, Environment environment) {
-  var result = '';
-  while (environment != null) {
-    result = '$result<ul>';
-    for (var symbol in environment.keys) {
-      result = '$result<li><b>$symbol</b>: ${environment[symbol]}</li>';
-    }
-    result = '$result</ul>';
-    result = '$result<hr/>';
-    environment = environment.owner;
-  }
-  element.innerHtml = result;
-}
-
-void main() {
-  var root = new Environment();
-  var native = Natives.import(root);
-  var standard = Standard.import(native.create());
-  var environment = standard.create();
-
-  var input = querySelector('#input') as TextAreaElement;
-  var output = querySelector('#output') as TextAreaElement;
-
-  querySelector('#evaluate').onClick.listen((event) {
-    var result = evalString(lispParser, environment, input.value);
-    output.value = result.toString();
-    inspector(querySelector('#inspector'), environment);
-  });
-  inspector(querySelector('#inspector'), environment);
-}