Introduce AngularJS to Piwik Platform: rewrite All Websites selector to use AngularJS

[mattab]

As part of our effort to introduce AngularJS in Piwik, we shall rewrite the All Websites dashboard using AngularJS.

The rewrite will bring a few powerful benefits:

• Introduce a modern JS library to Piwik: AngularJS, and introduce some best practises and patterns. See also Bundle AngularJS with Piwik #4691
• Our current JS code can be hard to maintain and innovate upon. The new All Websites JS code with AngularJS will be smaller and easier to improve in the future.
• let's add an inline search box to the All Websites page
  • this will let users easily search for particular websites on the page.

See also #2174

[tsteur]

In 4224360: Merge pull request #230 from piwik/angularjs_websites_selector

refs #4692 #2174 SiteSelector and AllWebsitesDashboard using AngularJS