Updates to DWC articles due to recent changes in our system.

Review URL: https://chromiumcodereview.appspot.com//11418184
Fix DWC spec - comment from closed code review.

Review URL: https://chromiumcodereview.appspot.com//11428040
DWC docs: mention boolean attributes explicitly. This is to address
https://github.com/dart-lang/dart-web-components/issues/216.

Review URL: https://chromiumcodereview.appspot.com//11414196
Minor fixes to dart:io article.

R=kathyw@google.com
BUG=

Review URL: https://chromiumcodereview.appspot.com/11413182
Minor updates to the native extensions article.

R=kathyw@google.com
BUG=

Review URL: https://chromiumcodereview.appspot.com/11316185
Updates in spec: mention alternative if syntax, remove section about generated
fields per id.

Review URL: https://chromiumcodereview.appspot.com//11411255
DWC spec: add links to where to find dart:html event names.

Review URL: https://chromiumcodereview.appspot.com//11421144
Merge branch 'shailen'

Created an article showing how to create a pub package and write unittests for it.

Created an authors file for shailen-tuli.
Modified articles.yaml with information about the new article.

BUG=

Review URL: https://chromiumcodereview.appspot.com/11280185
add libraries, imports, reexport, and metadata

BUG=

Review URL: https://chromiumcodereview.appspot.com//11416253
Small cleanups/updates to articles

Review URL: https://chromiumcodereview.appspot.com/11316250
update the DOM article

BUG=

Review URL: https://chromiumcodereview.appspot.com//11421155
Target 5 added, various edits, fixed reported bugs
Merge branch 'master' into tutorial611

kathy's comments, de-linked web-components for now

Merge branch 'master' into tutorial611

use vector_math instead of web_components as example. simplify

Merge branch 'master' into tutorial611

renamed todo-with-delete, renamed elements => children, new packages section, boilerplate web-components

Merge branch 'master' into tutorial611

renamed packages target

elements ----> children

adding images

changed name todo_with_delete, removed new-icon, added packages, also, beginnings of web-compoents

Merge branch 'master' into tutorial611

first steps to creating target 5

a few more nits to cleanup

resolving conflicts...where did the conflicts come from?

incorporated K's and S's review comments'

update version date on front page

Merge branch 'master' into tutorial611

finished up target 04, cleaned up some diagrams and code

Merge branch 'master' into tutorial611, modified diagrams that Seth had compressed.

Conflicts:
	src/site/docs/tutorials/add-elements/images/adds-dance.png
	src/site/docs/tutorials/add-elements/images/event-handler-idiom.png
	src/site/docs/tutorials/add-elements/images/event-handler-todo.png
	src/site/docs/tutorials/add-elements/images/todo-dart.png
	src/site/docs/tutorials/add-elements/images/todo-dom.png
	src/site/docs/tutorials/add-elements/images/todo-html.png
	src/site/docs/tutorials/add-elements/images/todo-screenshot.png
	src/site/docs/tutorials/add-elements/images/todo-screenshot2.png
	src/site/docs/tutorials/add-elements/images/type-dance.png
	src/site/docs/tutorials/get-started/images/function-parts.png

new target 4 plus info about CSS, mostly selectors

Merge branch 'master' into tutorial611

interim scary save

removed sections that are commented out, + seth edits

added send feedback to footer

Merge branch 'master' into tutorial2Nov

added tutorial to articles.yaml

removed example files, external links open in _blank

Merge branch 'master' into tutorial2Nov

added arrow icons to nav at bottom

fixed next/previous at bottom

some copyedits from kathy

BUG=

Review URL: https://chromiumcodereview.appspot.com/11428089
fixed typo
index.markdown

BUG=

Review URL: https://chromiumcodereview.appspot.com/11308285
shrink pngs for packages tutorial
don't use gsdview links for downloading

BUG=

Review URL: https://chromiumcodereview.appspot.com//11308292
First draft of reflection article

Staged at:

http://mirrors.dart-lang.appspot.com/articles/reflection-with-mirrors/

Review URL: https://chromiumcodereview.appspot.com/11412257
reduce line length, make a few small copyedits

TBR=sigmund

Review URL: https://chromiumcodereview.appspot.com/11280262
Fix headers in Chapter 5

TBR=sethladd

Review URL: https://chromiumcodereview.appspot.com/11419264
use new image for G+ shares

BUG=

Review URL: https://chromiumcodereview.appspot.com//11428134
remove known #import, update Embedding into DOM article

BUG=

Review URL: https://chromiumcodereview.appspot.com//11348302