instead of disabling the plugin immediately.

This allows us to change the view_mode dynamically.

Fixes #1072

updates #1072

Otherwise we might have stale disco info and no way to invalidate the cache.

fixes #1106

updates #1106

- Remove misleading comment and fix conditional logic
- Check that there's only one <item> element.

updates #1106

Fix two bugs as well.

- Pass by reference bug for presence defaults
- querySelector for `delay` returned nothing (use sizzle instead)

We no longer need inverse.css

updates #1091

updates #1091

updates #1091

updates #1091

updates #1091

updates #1091

for easier retrieval later and to work around MUC's inability to
retrieve VCards for users not in the MUC.

Updates #968

updates #968

updates #1094

updates #1094