* Empty chat area doesn't resize when hiding occupants.
* Properly change icon when toggling occupants

when trimming chats.

by not attempting to load `optional_dependencies` via require.js.

Instead, we just expect them to be plugins and to have been loaded already.

and use that in the tests, instead of a callback.

This change refactors out the plugin code from converse-core into
src/converse-puggable.js

Additionally, plugins now have an optional attribute `optional_dependencies`
which is an array of dependencies which are "nice-to-have" but not essential.

Work has also been done to ensure that a plugins' dependencies are first loaded
before the plugin itself.

Will have to come up with some other way to disable it in cases where it's not
needed.

when strict_plugin_dependencies is set to `false`.

To make overridding it easier.

We already emit an event when the roster is fetched from the XMPP server,
similarly, it would be useful to know when the roster was instead fetched from
the cache.

if it's defined, then we want the extra check that the jids match, otherwise
we might be attaching to someone else's session.

Don't <show> 'offline'.
Only include status_message when explicitly passed in as a string.

they might be MAM archived messages.

Fixes #650

So that they're not stored in MAM.

so that they're not stored in MAM and not forwarded.

updates #553

because the archive ids of messages weren't being stored.

further down in the chat box.

But make this behavior configurable. Updates #647

* Updated onDisconnected method to fire disconnected event. Issue #648

* Updated docs/CHANGES.md

Also, don't call scrollDown unnecessarily in showStatusMessages

so that we don't scroll down while the user is reading messages further up.

This lets variable interpolation still work (if Jed is loaded)