more link tweaking

src/site/docs/tutorials/shared-pkgs/index.markdown

 ---
 layout: default
 title: "Install Shared Packages"
 description: "Packages are bundles of source code, tools, and resources that help you to organize and share code"
 has-permalinks: true
 tutorial:
   id: packages
-next: web-ui
+next: web-ui/
 next-title: "Get Started with Web UI"
-prev: remove-elements
+prev: remove-elements/
 prev-title: "Remove DOM Elements"
 ---
 
 {% capture whats_the_point %}
 
 * Packages are awesome.
 * Packages are cool.
 * Share your code in packages, with all your friends at school.
 
 {% endcapture %}
 
 {% capture sample_links %}
 
 <p>
 Get the vector_math package and many others from:</p>
 
 <ul>
   <li>
-    <a href="http://pub.dartlang.org/"
+    <a href="https://pub.dartlang.org/"
        target="_blank">pub.dartlang.org</a>
   </li>
 </ul>
 
 {% endcapture %}
 
 {% capture content %}
 
 <div class="tute-target-title">
 <h1>{{page.title}}</h1>
 <h3>Borrow and share code.</h3>
 </div>
 
 Now that you're able to create and run a Dart application
 and have a basic understanding of DOM programming,
 you are ready to leverage code written by other programmers.
 Many interesting and useful packages of reusable Dart code
 are available at the
-<a href="http://pub.dartlang.org/">pub.dartlang.org</a>
+<a href="https://pub.dartlang.org/">pub.dartlang.org</a>
 repository.
 
 This target shows you how to use `pub`&mdash;a package manager
 that comes with Dart&mdash;to
 install one of the packages in the repository,
 the vector_math package.
 You can follow these same steps to install any package hosted at
-<a href="http://pub.dartlang.org/">pub.dartlang.org</a>;
+<a href="https://pub.dartlang.org/">pub.dartlang.org</a>;
 just change the package name when you get to that step.
 This target also describes some of the resources you can expect to find
 in a well-built package.
 
 * [About the pubspec.yaml file](#about-pubspec)
 * [Name the package dependencies](#name-dependencies)
 * [Install the package dependencies](#install-dependencies)
 * [What did you get (and not get)?](#about-packages)
 * [Import libraries from a package](#use-package)
 * [Other resources](#other-resources)
 
 ##About the pubspec.yaml file {#about-pubspec}
 
 To use an external package,
 your application must itself be a package.
 Any application with a valid pubspec.yaml file in its top-level directory
 is a package and can therefore use external packages.
 When you create an application using Dart Editor,
 Dart Editor automatically creates a `pubspec.yaml` file.
 
 Start Dart Editor and create a new application with the name `vector_victor`.
 Double click pubspec.yaml to view its contents.
 
 ![Dart Editor with pubspec.yaml file](images/victor-files.png)
 
 The pubspec.yaml file contains the package specification written in YAML
-(visit <a href="http://pub.dartlang.org/doc/pubspec.html">Pubspec Format</a>
+(visit <a href="https://pub.dartlang.org/doc/pubspec.html">Pubspec Format</a>
 for in-depth coverage).
 Dart Editor provides a user interface for editing the pubspec.yaml file
 so that you don't have to worry about the YAML format.
 Or you can click the **Source** tab at the bottom of the Editor pane
 to edit the YAML code directly.
 Below is the pubspec.yaml file that was
 created for the vector_victor application.
 
 ![The default pubspec.yaml file specifies name and description](images/pubspec.png)
 
@@ skipping 49 matching lines @@
 Dart Editor adds the package name to the list.
 
 ![The application is now dependent on vector_math](images/after-add.png)
 
 Notice the **Version** field.
 `any` means that this application can use
 any version of the vector_math package.
 You could instead specify a particular version of the package.
 When versioning becomes important to your project,
 check out
-<a href="http://pub.dartlang.org/doc/versioning.html">
+<a href="https://pub.dartlang.org/doc/versioning.html">
 Pub's Versioning Philosophy
 </a>.
 
 Here's the new pubspec.yaml file:
 
 ![Pubspec.yaml file with vector_math dependency](images/pubspec-vectormath.png)
 
-<a href="http://pub.dartlang.org/">pub.dartlang.org</a>
+<a href="https://pub.dartlang.org/">pub.dartlang.org</a>
 is the primary public repository for Dart packages.
 `pub` automatically checks that
 website when resolving package dependencies.
 To use one of the packages from that site,
 you can specify it by its simple name,
 as we have done here.
 
 ##Install the package dependencies {#install-dependencies}
 
 In Dart Editor, save pubspec.yaml with **File > Save**.
 When you save the file,
 Dart Editor automatically runs
-<a href="http://pub.dartlang.org/doc/pub-install.html">pub install</a>,
+<a href="https://pub.dartlang.org/doc/pub-install.html">pub install</a>,
 which recursively installs the Dart libraries
 from the packages in the dependencies list.
 You can also select **Pub Install** from the **Tools** menu in Dart Editor.
 
 Pub puts the libraries in a directory called packages
 under the application's top-level directory.
 Click the wee arrow to expand the packages directory.
 There you will find the vector_math directory,
 which links to the Dart libraries from the vector_math package.
 
@@ skipping 14 matching lines @@
 the vector_math package has other resources that might be useful to you
 that do not get installed into your application directory.
 Let's take a step back for a moment to look at what
 you got and where it came from.
 
 To see the contents of the vector_math package,
 visit the
 <a href="https://github.com/johnmccutchan/vector_math" target="_blank">
 Dart vector math repository
 </a>
-at GitHub.
+at github.
 Although many files and directories are in the repository,
 only one, `lib`, was installed when you ran pub install.
 
 <div>
   <hr>
   <div class="row">
     <div class="span2">
     <img src="images/libraries-folder.png"
          alt="Dart libraries directory"/>
     </div>
@@ skipping 26 matching lines @@
     <img src="images/other-folders.png"
          alt="Document, scripts, tests, and other resources"/>
     </div>
     <div class="span7">
       <em>Other resources</em>:
       Along with Dart libraries,
       a package might also contain other resources 
       such as example code, tests, scripts, and documentation.
       If a package contains these resources,
       they should be in the directories as specified in the pub
-<a href="http://pub.dartlang.org/doc/package-layout.html">conventions</a>.
+<a href="https://pub.dartlang.org/doc/package-layout.html">conventions</a>.
     </div>
   </div>
   <hr>
 </div>
 
 ##Import libraries from a package {#use-package}
 
 Open the vector_math directory by clicking the little arrow.
 
 ![Finally, the vector_math library files](images/the-vectormath-library.png)
@@ skipping 13 matching lines @@
 import 'package:vector_math/vector_math.dart';
 {% endprettify %}
 
 Note that you specify the filename, not the library name.
 
 ##Other resources
 
 <ul>
   <li>
     Dart developers share packages at
-    <a href="http://pub.dartlang.org/">pub.dartlang.org</a>.
+    <a href="https://pub.dartlang.org/">pub.dartlang.org</a>.
     Look there for packages that might be useful to you,
     or share your own Dart packages.
-    See the <a href="http://pub.dartlang.org/doc/">pub documentation</a>
+    See the <a href="https://pub.dartlang.org/doc/">pub documentation</a>
     to get started using and sharing packages.
   </li>
   <li>
     One important package that you will find there
     is
-    <a href="http://pub.dartlang.org/packages/web_ui">web_ui</a>&mdash;a package
+    <a href="https://pub.dartlang.org/packages/web_ui">web_ui</a>&mdash;a package
     created by the Dart team that lets you use Web components and templating.
     The
     <a href="/docs/tutorials/web-ui/">next target</a> covers Web UI.
   </li>
 </ul>
 
 {% endcapture %}
 
 {% include tutorial.html %}