[next] Embed plus (#1877)

* Implement StreamEmbed instance and rename library to coral

* Add article & articleButton.html, only show embed htmls in production

* Respect assetURL

* Add tests

* Add parseHashQuery

* Fix permalink query and integration tests

* Fix permalink URL

* Remove optionalparams from pym

* Scroll when showing permalink view

* Implement autoRender

* AutoRender immediately when render permalink

* Add test for `showPermalink` event

* Add comment

package.json

@@ -186,6 +186,7 @@
     "jest": "^23.4.1",
     "jest-junit": "^5.1.0",
     "jest-localstorage-mock": "^2.2.0",
+    "jest-mock-console": "^0.4.0",
     "jsdom": "^11.11.0",
     "loader-utils": "^1.1.0",
     "material-design-icons": "^3.0.1",