mod_conversejs: This one weird trick updates options on reload Options queried from the config in get_converse_options() would take effect immediately after Prosody reloads the config. Including 'conversejs_options' in this behaviour by simply moving a line seems worth it.

This module blocks configured queries that change server state.

E.g. to make vCard storage read-only:

``` lua
readonly_stores = {
	vcard = { "vcard-temp", "vCard" };
}
```