Added the continueParsing option to ArgParser.

pkg/args/lib/args.dart

Index: pkg/args/lib/args.dart
diff --git a/pkg/args/lib/args.dart b/pkg/args/lib/args.dart
index be1a6efa4d819550aee0c9a8819d7c361ac5c2a3..db21ed7baad04a158a7e15795e8e1036e1afd09c 100644
--- a/pkg/args/lib/args.dart
+++ b/pkg/args/lib/args.dart
@@ -314,9 +314,13 @@ class ArgParser {
   /**
    * Parses [args], a list of command-line arguments, matches them against the
    * flags and options defined by this parser, and returns the result.
+   *
+   * If [continueParsing] is set, the parser will continue parsing even after it
+   * finds an argument that is not an option. This allows you to specify options
+   * after your command parameters.
    */
-  ArgResults parse(List<String> args) =>
-      new Parser(null, this, args.toList()).parse();
+  ArgResults parse(List<String> args, {bool continueParsing: false}) =>
+      new Parser(null, this, args.toList(), continueParsing).parse();
 
   /**
    * Generates a string displaying usage information for the defined options.