Our handler was too restrictive due to the namespace matching.
When joining a room and the room's remote server can not be found, then
the resulting error messages doesn't not have the MUC namespace.

* Allow for shift-enter to insert newlines

See issue #1081

* Update CHANGES.md

Also made a few other minor improvements and did some cleanup.

The 'dist/converse-no-dependencies-es5.js' rule is called
'dist/converse-no-dependencies-es2015.js'.
Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

Otherwise it attemtps to send out stanzas (causing `this.socket is null`
errors when using websocket).

However, when a new chat is created due to an incoming message, and
there aren't any other chats visible, then show it.

Use one event instead of two, by listening to `num_unread` on chatboxes.

New in the sense that we haven't seen them before

due to Awesomplete doing things to the DOM and then confusing Snabbdom.

Currently only allows enabling an "App Service", based on pass-in
configuration values.

when we received a message for a yet non-existing chat in singleton
mode.

This is a workaround until we have support for XEP-0198

updates #1111

Calling `remove` without models does nothing