Added documentation links to all of the pkg packages hosted on api.dartlang.org.

Review URL: https://codereview.chromium.org//12218119

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@18414 260f80e4-7a28-3924-810f-c04153c831b5

pkg/args/pubspec.yaml

@@ -1,6 +1,7 @@
 name: args
 author: "Dart Team <misc@dartlang.org>"
 homepage: http://www.dartlang.org
+documentation: http://api.dartlang.org/docs/pkg/args.html
 description: >
  Libraries for defining parsers for parsing raw command-line arguments into
  a set of options and values using GNU and POSIX style options.

pkg/intl/pubspec.yaml

@@ -1,6 +1,7 @@
 name: intl
 author: "Dart Team <misc@dartlang.org>"
 homepage: http://www.dartlang.org
+documentation: http://api.dartlang.org/docs/pkg/intl.html
 description: >
   Contains code to deal with internationalized/localized
   messages, date and number formatting and parsing,

pkg/logging/pubspec.yaml

@@ -1,6 +1,7 @@
 name: logging
 author: "Dart Team <misc@dartlang.org>"
 homepage: http://www.dartlang.org
+documentation: http://api.dartlang.org/docs/pkg/logging.html
 description: >
  Provides APIs for debugging and error logging. This library introduces
  abstractions similar to those used in other languages, such as the Closure JS

pkg/meta/pubspec.yaml

@@ -1,6 +1,7 @@
 name: meta
 author: "Dart Team <misc@dartlang.org>"
 homepage: http://www.dartlang.org
+documentation: http://api.dartlang.org/docs/pkg/meta.html
 description: >
  This library contains the definitions of annotations that provide additional
  semantic information about the program being annotated. These annotations are

pkg/serialization/pubspec.yaml

@@ -1,6 +1,7 @@
 name: serialization
 author: "Dart Team <misc@dartlang.org>"
 homepage: http://www.dartlang.org
+documentation: http://api.dartlang.org/docs/pkg/serialization.html
 description: >
   Provide a serialization facility for Dart objects.
 dependencies:

pkg/unittest/pubspec.yaml

@@ -1,6 +1,7 @@
 name: unittest
 author: "Dart Team <misc@dartlang.org>"
 homepage: http://www.dartlang.org
+documentation: http://api.dartlang.org/docs/pkg/unittest.html
 description: >
  A library for writing dart unit tests.
 dependencies: