typo fix with code example
Update two figures

BUG=9052

Review URL: https://chromiumcodereview.appspot.com/12642009
add simd preso

BUG=

Review URL: https://chromiumcodereview.appspot.com//12531005
Merge pull request #39 from financeCoding/futures-and-error-handling-typo

typo fix with code example in futures-and-error-handling
add more samples
convert to markdown

staged at http://idiomatic.dart-lang.appspot.com/articles/idiomatic-dart/

Review URL: https://chromiumcodereview.appspot.com//12806003
Minor fixes.

Future.delayed calls updated.
Link to other Futures articles no longer absolute.

BUG=

Review URL: https://chromiumcodereview.appspot.com//12540004
update some book figures

Review URL: https://chromiumcodereview.appspot.com/12632019
move dart-web-components to web-ui; remove duplicate dart2js and dart-vm pages

Also general link cleanup. Staged at:

http://webui.dart-lang.appspot.com/

BUG=8105

Review URL: https://chromiumcodereview.appspot.com/12615008
fix feedback link

BUG=

Review URL: https://chromiumcodereview.appspot.com//12929007
add style for cascades

BUG=

Review URL: https://chromiumcodereview.appspot.com//12730022
Basic necessities for article tests.

Review URL: https://chromiumcodereview.appspot.com/12717012