Add analytics to analyzer-cli and analysis server.

pkg/analyzer_cli/bin/analyzer.dart

 #!/usr/bin/env dart
 // Copyright (c) 2015, 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.
 
+import 'dart:io';
+
 import 'package:analyzer_cli/starter.dart';
 
 /// The entry point for the command-line analyzer.
-void main(List<String> args) {
+main(List<String> args) async {
   CommandLineStarter starter = new CommandLineStarter();
-  starter.start(args);
+
+  // Wait for the starter to complete.
+  await starter.start(args);
+
+  // Call exit() explicitly. Analytics calls could still be ongoing, but we
+  // don't want to delay returning the analysis results because of them.
+  exit(exitCode);
 }