Add logos to dart web components article.

Review URL: https://chromiumcodereview.appspot.com//11149005
Fixed typos.
Merge pull request #14 from dart-lang/A_fix_typo

Fixed typos.
update homepage

BUG=

Review URL: https://chromiumcodereview.appspot.com//11155004
clean up samples

BUG=

Review URL: https://chromiumcodereview.appspot.com//11151014
Add width to images in web components article.

Review URL: https://chromiumcodereview.appspot.com//11147024
Add examples for dart-web-components back in the site (unfortunately github
pages cannot be used within iframes)

Review URL: https://chromiumcodereview.appspot.com//11148027
Squashed commit of the following:

commit ef99e6f11309c17172f187ca1fe5b97b9f5ed9ea
Author: Kathy Walrath <kathyw@google.com>
Date:   Tue Oct 16 10:14:26 2012 -0700

    add link to blog post (fix no-op front page link)

commit 523a2db6f4842ec97fa712b8943af849329df5ed
Author: Kathy Walrath <kathyw@google.com>
Date:   Tue Oct 16 09:42:02 2012 -0700

    Add index page for the book directory

commit 273af97088744b0fccf106a4e564b56a273b1dd9
Author: Kathy Walrath <kathyw@google.com>
Date:   Tue Oct 16 08:42:08 2012 -0700

    Fix links in chapter 5

commit 33d0c84fb287969e8892f39adb547894ec82c439
Author: Kathy Walrath <kathyw@google.com>
Date:   Tue Oct 16 08:39:48 2012 -0700

    Fix link formatting in chapter 4

commit 89155b6912d28ec08e9ed5c10e99bc7f6e906309
Merge: b7ba913 0d3ab88
Author: Kathy Walrath <kathyw@google.com>
Date:   Tue Oct 16 08:15:42 2012 -0700

    Merge branch 'm1' of github.com:dart-lang/dartlang.org into m1

commit b7ba9133e4880a4a356c084426f05b7e13034405
Author: Kathy Walrath <kathyw@google.com>
Date:   Tue Oct 16 08:14:16 2012 -0700

    Fix note/warning format in chapter 3

commit 0d3ab88332c25dcbed8e9f70c747ecded197366d
Author: Seth Ladd <sethladd@google.com>
Date:   Tue Oct 16 08:04:36 2012 -0700

    tweak book footer

commit 7004653f733e8e6c2b652e9c4bfa954e39580e94
Author: Kathy Walrath <kathyw@google.com>
Date:   Tue Oct 16 07:46:44 2012 -0700

    Custom header and footer for book pages

    (copied from default header and footer; should be
    refactored)

commit 697e0cb685c71f35d8f2cb38f0db72bf056015a6
Author: Seth Ladd <sethladd@google.com>
Date:   Mon Oct 15 22:39:23 2012 -0700

    crush png

commit 417c9145e0cabfb2d5dc0b0bf6d6cfe5b6c8a4c3
Author: Seth Ladd <sethladd@google.com>
Date:   Mon Oct 15 22:32:37 2012 -0700

    add link to m1 announcement

commit c043ed7c13ba8f450f83dfbf65ac30c4549e581f
Author: Seth Ladd <sethladd@google.com>
Date:   Mon Oct 15 22:24:09 2012 -0700

    add video and birthday hat to homepage

commit 9907bcd936b40dbfca9cd4169d7b49e17182f40d
Author: Seth Ladd <sethladd@google.com>
Date:   Mon Oct 15 21:53:40 2012 -0700

    move buttons from editor hero block

commit bb78279df29429cd19d0175e4c037d9d57b39108
Author: Seth Ladd <sethladd@google.com>
Date:   Mon Oct 15 21:37:14 2012 -0700

    move book into more specific dir, and redirect old tours

commit c525bee4fc3408f97010a1b95ffa022b6d831bba
Author: Kathy Walrath <kathyw@google.com>
Date:   Mon Oct 15 17:43:35 2012 -0700

    Improve ch01 formatting

commit af3e689c46a48b640e5c23b02aecafd044ab3a21
Merge: a1d5124 88bf302
Author: Seth Ladd <sethladd@google.com>
Date:   Mon Oct 15 17:22:47 2012 -0700

    Merge branch 'm1' of github.com:dart-lang/dartlang.org into m1

commit a1d5124a2c48b0dcb12f14b93a0ea16094730c22
Merge: 6cb9426 29b66df
Author: Seth Ladd <sethladd@google.com>
Date:   Mon Oct 15 17:21:41 2012 -0700

    Merge branch 'master' into m1

commit 88bf302929c017774f5a5f15cff32a9404e9d75f
Author: Kathy Walrath <kathyw@google.com>
Date:   Mon Oct 15 17:13:05 2012 -0700

    Add the book cover

commit 9188645acf0b68613d9c47fffd0cc084ff2f3300
Author: Kathy Walrath <kathyw@google.com>
Date:   Mon Oct 15 17:11:24 2012 -0700

    Add Foreword and Preface (wonkily formatted)

commit eda14facd266104c9dca359f361fd2f387ddbab4
Author: Kathy Walrath <kathyw@google.com>
Date:   Mon Oct 15 16:54:15 2012 -0700

    Add the rest of the chapters in the book (formatting still a bit wonky).

commit b0cd999cb2de5dcf173651d99b4f548d4421c795
Author: Kathy Walrath <kathyw@google.com>
Date:   Mon Oct 15 16:28:41 2012 -0700

    Add book figures

commit 6564df738f610a984a78de29a4c833d834beeb10
Author: Kathy Walrath <kathyw@google.com>
Date:   Mon Oct 15 16:11:42 2012 -0700

    Update the language specification.

commit 6cb94266aea9ba528200d336c411bb56d983ce86
Author: Kathy Walrath <kathyw@google.com>
Date:   Mon Oct 15 15:33:29 2012 -0700

    Chapters 2 & 3 from book.

    NOTE: These link to other chapters that haven't been added yet.

commit 67e489c68a0433e92dfe5de0cc691f3e49cdbeb2
Author: Kathy Walrath <kathyw@google.com>
Date:   Fri Oct 12 16:31:29 2012 -0700

    update #import directives on the front page (and fix a syntax error)

    library examples might not work

commit 9a37a98f9e6e8e00e0b6cb3e1fe6ae3ff35505d6
Author: Bob Nystrom <robert@stuffwithstuff.com>
Date:   Thu Oct 11 11:23:15 2012 -0700

    Remove pub docs and point to pub.dartlang.org.
fix link for troubleshoot

BUG=

Review URL: https://chromiumcodereview.appspot.com//11198022
small fix to tools.markdown

(edited directly in the github web UI)
Turns out that Dartium doesn't have `--enable-experimental-webkit-features by default` :(
Redirect pub doc to pub.dartlang.org

Test by following these URLs:
pub-redirect.dart-lang.appspot.com/docs/pub-package-manager/
pub-redirect.dart-lang.appspot.com/docs/pub-package-manager/pubspec.html

Review URL: https://chromiumcodereview.appspot.com/11183047
add two more samples

BUG=

Review URL: https://chromiumcodereview.appspot.com//11184024
kathy's edits + iteration
style.css
added new diagrams
add back
replace logo

BUG=

Review URL: https://chromiumcodereview.appspot.com//11184036
more dartisans

BUG=

Review URL: https://chromiumcodereview.appspot.com//11198071
little edits to prep for Friday push
ready for push