Update Polymer to 2.6.0

To see changes from up to 2.4.0, see:

https://github.com/Polymer/polymer/blob/master/CHANGELOG.md

Ensure backwards-compatibility with Ember 3.0 🐹

⚡️

Fix build when project has no package file 🔨

Fix the build process in the case where a package is installed that for some reason does not have its package.json or bower.json file defined. See #85. Thanks to @PabloHidalgo.

Cheers. 🍻

Update Ember to v2.18.0

Update Ember version, as well as ember-cli, polymer and other dep versions.

Fix recognition of some web components

Fix recognition of some web components. Elements like these which do not have web-components keywords in their bower.json should now be recognized.

This based on when the main entry point is equal to the package name plus .html.

Cheers 🍺

Minor fixes and features

Allow for Global Polymer settings as requested in #76. See https://www.polymer-project.org/2.0/docs/devguide/settings for details. Allows for settings options you would in Polymer normally set like this:

  <script>
    window.Polymer = {
      rootPath: '/your/application/root'
    };
  </script>

Like this in the ember-polymer config:

  globalPolymerSettings: {
    rootPath: '/your/application/root'
  }

Polymer v2.0 support 💎🌺

• Has support for Polymer v2.0!
• Uses polymer-bundler to bundle elements instead of vulcanize
• Codebase is more modular and has more effective tests
• The addon now uses a broccoli plugin in auto importing elements, which results in less tmp folders
• We now use parse5 to process the html imports file instead of using regexes

Rewritten code base

More robust codebase and tests.

Allow Global Polymer settings

See (https://www.polymer-project.org/1.0/docs/devguide/settings)[https://www.polymer-project.org/1.0/docs/devguide/settings]. Allows you to configure settings like this:

  <script>
    /* this script must run before Polymer is imported */
    window.Polymer = {
      dom: 'shadow',
      lazyRegister: true
    };
  </script>

Improve broccoli element building

By using create file plugins. Also, update terminology to match bundler.