Keep the focus in the input after filtering.
Prevent form submission from reloading the page.

According to the require.js docs this shouldn't be done.
http://requirejs.org/docs/whyamd.html#namedmodules

Move styles related to embedded chats to `css/converse-muc-embedded.css`

Don't include muc-embedded by default

without underscore.js

To illustrate that this is not necessary (and also not possible with
non-bundled plugins).

to indicate that it's private and to differentiate it from the outer "global"
converse object.

- Remove the `plugins.remove` API method.
- Throw an error when attempting to register multiple plugins with the same name.

updates #752

To illustrate that this is not necessary (and also not possible with
non-bundled plugins).

to indicate that it's private and to differentiate it from the outer "global"
converse object.