Update charted to 0.4.8 and roll

packages/args/README.md

 Parses raw command-line arguments into a set of options and values.
 
 This library supports [GNU][] and [POSIX][] style options, and it works
 in both server-side and client-side apps.
 
 ## Defining options
 
 First create an [ArgParser][]:
 
     var parser = new ArgParser();
@@ skipping 33 matching lines @@
 
 ```dart
 parser.addOption('mode', defaultsTo: 'debug');
 parser.addFlag('verbose', defaultsTo: false);
 ```
 
 The default value for non-flag options can be any string. For flags, it must
 be a `bool`.
 
 To validate a non-flag option, you can use the `allowed` parameter to provide an
-allowed set of values. When you do, the parser throws a [FormatException] if the
-value for an option is not in the allowed set. Here's an example of specifying
-allowed values:
+allowed set of values. When you do, the parser throws an
+[`ArgParserException`][ArgParserException] if the value for an option is not in
+the allowed set. Here's an example of specifying allowed values:
+
+[ArgParserException]: https://www.dartdocs.org/documentation/args/latest/args/ArgParserException-class.html
 
 ```dart
 parser.addOption('mode', allowed: ['debug', 'release']);
 ```
 
 You can use the `callback` parameter to associate a function with an option.
 Later, when parsing occurs, the callback function is invoked with the value of
 the option:
 
 ```dart
@@ skipping 220 matching lines @@
   final name = "commit";
   final description = "Record changes to the repository.";
 
   CommitCommand() {
     // [argParser] is automatically created by the parent class.
     argParser.addFlag('all', abbr: 'a');
   }
 
   // [run] may also return a Future.
   void run() {
-    // [options] is set before [run()] is called and contains the options
+    // [argResults] is set before [run()] is called and contains the options
     // passed to this command.
-    print(options['all']);
+    print(argResults['all']);
   }
 }
 ```
 
 Commands can also have subcommands, which are added with [addSubcommand][]. A
 command with subcommands can't run its own code, so [run][] doesn't need to be
 implemented. For example:
 
 ```dart
 class StashCommand extends Command {
   final String name = "stash";
   final String description = "Stash changes in the working directory.";
 
   StashCommand() {
     addSubcommand(new StashSaveCommand());
     addSubcommand(new StashListCommand());
   }
 }
 ```
 
 [CommandRunner][] automatically adds a `help` command that displays usage
 information for commands, as well as support for the `--help` flag for all
 commands. If it encounters an error parsing the arguments or processing a
-command, it throws a [UsageError][]; your `main()` method should catch these and
+command, it throws a [UsageException][]; your `main()` method should catch these and
 print them appropriately. For example:
 
 ```dart
 runner.run(arguments).catchError((error) {
-  if (error is! UsageError) throw error;
+  if (error is! UsageException) throw error;
   print(error);
   exit(64); // Exit code 64 indicates a usage error.
 });
 ```
 
 ## Displaying usage
 
 You can automatically generate nice help text, suitable for use as the output of
 `--help`. To display good usage information, you should provide some help text
 when you create your options.
@@ skipping 17 matching lines @@
 by using the `allowedHelp:` parameter:
 
 ```dart
 parser.addOption('arch', help: 'The architecture to compile for',
     allowedHelp: {
       'ia32': 'Intel x86',
       'arm': 'ARM Holding 32-bit chip'
     });
 ```
 
-To display the help, use the [getUsage()][getUsage] method:
+To display the help, use the [usage][usage] getter:
 
 ```dart
-print(parser.getUsage());
+print(parser.usage);
 ```
 
 The resulting string looks something like this:
 
 ```
 --mode            The compiler configuration
                   [debug, release]
 
 --out=<path>      The output path
 --[no-]verbose    Show additional diagnostic info
 --arch            The architecture to compile for
       [arm]       ARM Holding 32-bit chip
       [ia32]      Intel x86
 ```
 
 [posix]: http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap12.html#tag_12_02
 [gnu]: http://www.gnu.org/prep/standards/standards.html#Command_002dLine-Interfaces
 [ArgParser]: http://www.dartdocs.org/documentation/args/latest/index.html#args/args.ArgParser
 [ArgResults]: http://www.dartdocs.org/documentation/args/latest/index.html#args/args.ArgResults
-[CommandRunner]: http://www.dartdocs.org/documentation/args/latest/index.html#args/args.CommandRunner
-[Command]: http://www.dartdocs.org/documentation/args/latest/index.html#args/args.Command
-[UsageError]: http://www.dartdocs.org/documentation/args/latest/index.html#args/args.UsageError
+[CommandRunner]: http://www.dartdocs.org/documentation/args/latest/index.html#args/command_runner.CommandRunner
+[Command]: http://www.dartdocs.org/documentation/args/latest/index.html#args/command_runner.Command
+[UsageException]: http://www.dartdocs.org/documentation/args/latest/index.html#args/command_runner.UsageException
 [addOption]: http://www.dartdocs.org/documentation/args/latest/index.html#args/args.ArgParser@id_addOption
 [addFlag]: http://www.dartdocs.org/documentation/args/latest/index.html#args/args.ArgParser@id_addFlag
 [parse]: http://www.dartdocs.org/documentation/args/latest/index.html#args/args.ArgParser@id_parse
 [rest]: http://www.dartdocs.org/documentation/args/latest/index.html#args/args.ArgResults@id_rest
 [addCommand]: http://www.dartdocs.org/documentation/args/latest/index.html#args/args.ArgParser@id_addCommand
 [getUsage]: http://www.dartdocs.org/documentation/args/latest/index.html#args/args.ArgParser@id_getUsage
-[addSubcommand]: http://www.dartdocs.org/documentation/args/latest/index.html#args/args.Command@id_addSubcommand
-[run]: http://www.dartdocs.org/documentation/args/latest/index.html#args/args.Command@id_run
+[addSubcommand]: http://www.dartdocs.org/documentation/args/latest/index.html#args/command_runner.Command@id_addSubcommand
+[run]: http://www.dartdocs.org/documentation/args/latest/index.html#args/command_runner.Command@id_run