Vanilla dart app updates

This includes the change from ids to classes

* Included `todomvc-app-css`, this includes the new UI.
* Replaced bower by NPM.
* Include all files that aren't needed in the repo in the gitignore

Ref gh-1110

Ref https://www.dartlang.org/tools/editor/

⚡️ Fixing the flake ⚡️

this includes the change from ids to classes

This isn't in the spec and didn't add any value.

this includes the change from ids to classes

This test was causing us issues on CI for several reasons. The first
being that we were touching the DOM outside of webdrivers promise loop
(via Q). The second cause of issues was that we were holding onto DOM
nodes for a long time after we first queried the DOM, allowing the
pointers to potentially go stale.

update `vue` example to use classes

This includes the change from ids to classes

Update `react` example to use classes

This includes the change to use classes instead of ids

9429daa2

fix stale element errors

Drop the YUI app

By converting the find and click to a 1 op this avoides the issue of a
stale element.

From the official site:
	"The YUI library is no longer actively maintained. "

We shouldn't suggest anybody to use a framework which isn't active
anymore.

Ref http://yahooeng.tumblr.com/post/96098168666/important-announcement-regarding-yui

✋ bye sauce hello travis

🐛 Fix test routing selector bug

It was seeding too many items, thus making the tests freak out.

IE11 fix for Dojo example, fixes #1349.