pub site: update dependencies and fix analyzer

app/lib/colored_markdown.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library pub_dartlang_org.colored_markdown;
 
 import 'dart:convert';
 
 import 'package:analyzer/analyzer.dart';
-import 'package:analyzer/src/generated/scanner.dart';
+import 'package:analyzer/dart/ast/token.dart';
+import 'package:analyzer/src/dart/scanner/reader.dart';
+import 'package:analyzer/src/dart/scanner/scanner.dart';
 import 'package:analyzer/src/string_source.dart';
 import 'package:html/parser.dart' as html;
 import 'package:markdown/markdown.dart';
 
 String markdownToHtml(String text) {
   var lines = text.replaceAll('\r\n', '\n').split('\n');
   var document = new Document();
   var blocks = document.parseLines(lines);
 
   var colorizer = new ColorizeDartCode();
@@ skipping 192 matching lines @@
 
   bool _isCodeElement(Element element)
       => element.tag == 'code' &&
          element.attributes['class'] == 'language-dart' &&
          element.children.length == 1 &&
          element.children[0] is Text;
 
   Text _getSourceFromElement(Element element)
       => (element.children.first as Element).children.first as Text;
 }