..by waiting for DOM states instead of checking them only once.

* No need to recheckout gh-pages since the submodule already clones the branch.
* Fix / Remove wonky cp

-B is what we want here :)

Polymer CSS (css level 4 features) is causing csso problems

Skip it for now since polymer vulcanize already gives us wins.

* Delete ancient ember version

* Rename ember-cli example to emberjs

* Update image min dep

* Use vinyl fs directly for symlink fix

Fixes #1635

This will prevent invalid deploys when we encounter errors instead of a
partial complete deploy.

ref #1635

Update to Ember 2.6

* tests: cache node_modules

Move chrome to snapshots

* tests: Bump selenium version

* tests: Bump drool to v0.4.0

* tests: Remove chromedriver download

* test: Remove direct logs call.

Compiling as downloaded (with `tsc -p js/`) yields the following error:
```
js/app.tsx(12,27): error TS2307: Cannot find module './TodoModel'.
```

Update todomvc-aurelia 0.2.0 (using Aurelia 1.0.0.beta-1)

Fix TypeError: webdriver.WebDriver.Logs is not a function (#1605)

Webdriver logs in actual version of selenium should never be instantiated directly:
https://github.com/SeleniumHQ/selenium/blob/fa5ac92b451cff497e686d8e1e67c9c3101440a3/javascript/node/selenium-webdriver/lib/webdriver.js#L1429-L1432

But drool still uses selenium 2.46.1:
https://github.com/samccone/drool/commit/3770a157d218e6ea27ef9fd2e78f58105375fca0

So the fast fix is the old version of selenium.

Fixes #1605.

Do not exclude es6 example from lint

Updating the Marionette, Chaplin Comparision Link

since 
https://github.com/tastejs/todomvc/pull/1567

We can now handle es6 :)

Vanilla ES6, take 2

add Code of Conduct

adapted from http://contributor-covenant.org

updates all components to latest releases (Aurelia 1.0.0.beta, todomvc-app-css 2.0.4, todomvc-common 1.0.2, ...) and re-bundled everything

Close #1577

- Update sourcemap
- AngularJS upgrade to 1.4
- app-css update