Somehow the tests are flaky when the router sets a URL fragment for login or
registration, so I've now added an event handler which does the work without
setting the URL fragment.

The router is still there so that one can manually link to a URL that has the
registration form open. (Issue #828)

* In certain places, use native methods instead of jQuery
* Nicer rendering of registration forms
* Use CSS3 fade-in animations.

* Translated using Weblate (German)

Currently translated at 98.4% (260 of 264 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/de/

* Translated using Weblate (French)

Currently translated at 99.6% (263 of 264 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/fr/

* Translated using Weblate (Indonesian)

Currently translated at 36.3% (97 of 267 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/id/

* Translated using Weblate (Indonesian)

Currently translated at 34.0% (91 of 267 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/id/

* Translated using Weblate (Indonesian)

Currently translated at 32.9% (88 of 267 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/id/

* Translated using Weblate (Indonesian)

Currently translated at 32.9% (88 of 267 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/id/

* Translated using Weblate (Indonesian)

Currently translated at 33.7% (90 of 267 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/id/

* Translated using Weblate (German)

Currently translated at 98.1% (262 of 267 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/de/

* Translated using Weblate (Norwegian Bokmål)

Currently translated at 72.6% (194 of 267 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/nb/

when a connection can't be established.

In Tiki, features are built-in (but optional) to avoid http://pluginproblems.com/

Also, turn the sections about the fiddle example and the generator into notes.

Also improve the introductory text.