format code, removed unused variables and deprecated usage

lib/src/arg_results.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 args.src.arg_results;
 
 import 'package:collection/wrappers.dart';
 
 import 'arg_parser.dart';
 
 /// Creates a new [ArgResults].
 ///
 /// Since [ArgResults] doesn't have a public constructor, this lets [Parser]
 /// get to it. This function isn't exported to the public API of the package.
 ArgResults newArgResults(ArgParser parser, Map<String, dynamic> parsed,
-      String name, ArgResults command, List<String> rest,
-      List<String> arguments) {
+    String name, ArgResults command, List<String> rest,
+    List<String> arguments) {
   return new ArgResults._(parser, parsed, name, command, rest, arguments);
 }
 
 /// The results of parsing a series of command line arguments using
 /// [ArgParser.parse()].
 ///
 /// Includes the parsed options and any remaining unparsed command line
 /// arguments.
 class ArgResults {
   /// The [ArgParser] whose options were parsed for these results.
@@ skipping 59 matching lines @@
   /// value would be used instead.
   bool wasParsed(String name) {
     var option = _parser.options[name];
     if (option == null) {
       throw new ArgumentError('Could not find an option named "$name".');
     }
 
     return _parsed.containsKey(name);
   }
 }