Also fixed an issue w.r.t the plugin architecture. Previously infinite
recursion would happen when more than one plugin was overriding a method.
Resolved now by using a wrapper function that lazily sets the correct super
method.
The __ translate method should only be run *after* converse.js has been
initialized and we know what the actual desired language is
Also fix bug in src/locales.js where wrong langs were assigned to wrong keys.
The ChatBox.show() method was being called for every invocation, 100ms after
the fact, instead of it being called only once.
Fixed that and also changed to call it at the start.
First component to remove is MUC which was moved to src/converse-muc.js
The components are written as plugins and use converse.js's plugin machinery.
Update the plugin docs somewhat with new insites found while working on the muc
plugin.