Support to send the registration form as legacy or xform, we
use the same variable form_type that was already being used when
calling render
Added submission tests

Two tests were created to see if RegisterPanel.form_type is set
to correctly to legacy or xform when receiving server registration
form.

Fix collapsed group visibility on reload

Close #374

Fixes #372

Fix rooms grouping examples in docs

Fixing when the path has space, it closes #368

Fix this by pointing to the tag via a git URL

Also update changelog and fix some linting errors.

Fixes #360

Adding 'rooms' API

fixes #364

updates #359

Fix a timeout bug in chat state notifications

* Update the docs to mention the new ``authentication`` option.
* Update failing tests due to ``prebind`` being replaced with ``authentication``.
* Rename 'manual' value for authentication to 'login' since it's used in both manual and auto cases.

Conflicts:
	converse.js

This caused a bug whereby a chat box would open only on chat state
notifications.

Also refactored the chats.open and chats.get methods so that they now reuse the
same map function and so that chats.get can now return any chat box and not
just already open ones.

Updated the tests to properly test this and updated the docs.

Fix the known bug where a state notification reopens a chat box

Fix the ChatRoomOccupants storage id

Fix the plugin extend function